21 Best Electric Blue Acara Tank Mates (Compatible Species Guide)

Last Updated: May 12, 2026

Electric Blue Acaras are one of the most underrated cichlids in the hobby. They’re manageable enough for intermediate keepers, colorful enough to anchor a display tank, and compatible with a surprisingly wide range of fish — until they breed. When a pair claims a spawning site, the temperament shifts. Fish that lived peacefully in the same tank for months suddenly become obstacles. That’s the part most guides skip over, and it’s exactly what you need to plan around.

The Blue Acara doesn’t just live in your tank. It claims part of it.

Understanding Blue Acaras

Electric Blue Acaras (Andinoacara pulcher hybrid) originate from South America and belong to the cichlid family — a family famous for territorial fish. But Blue Acaras sit at the calm end of that spectrum. They grow to around 6–7 inches (15–18 cm), top out at a manageable size for medium tanks, and generally ignore tank mates unless they’ve got eggs on the ground.

That last part matters. Breeding pairs become a completely different animal. I’ve kept these fish alongside angelfish and corydoras with zero problems for months — then the pair locked onto a flat rock and cleared a 12-inch (30 cm) radius around it overnight. Any fish that wandered into that zone got chased hard. This is normal cichlid behavior, but it catches hobbyists off guard when the fish had been so peaceful before.

Their Characteristics

Blue Acaras are considered an ideal cichlid for community tanks — not peaceful community tanks, but cichlid-community tanks where everyone is big enough to not be lunch. These freshwater fish typically reach 4–7 inches (10–18 cm) and are carnivores at heart, so their diet should include proteins like bloodworms, brine shrimp, and quality pellets. They’re one of the few cichlids where you actually have options for tank mates. That said, compatible doesn’t mean zero conflict — it means manageable conflict with the right setup.

When breeding, females lay 150–200 eggs that hatch in 2–3 days. During this window, the whole tank dynamic changes. The pair becomes territorial toward anything that comes near the spawn site, and even established tank mates can take damage if the tank isn’t big enough to give other fish an escape route.

What People Get Wrong About Blue Acara Tank Mates

The biggest mistake is treating the Blue Acara like a general community fish. People read “semi-aggressive” and think that means they can pair them with tetras, guppies, and other small fish. Wrong. “Semi-aggressive” for a cichlid means they’re not actively hunting their tank mates — it does not mean small fish are safe. A 6-inch (15 cm) cichlid that’s been peaceful for six months will still eat a neon tetra the moment it gets close enough at feeding time.

The second mistake is not planning for breeding aggression. Blue Acaras will breed in captivity — easily. Most pairs that are well-fed and in good water conditions will attempt to spawn multiple times a year. Every spawn cycle means 2–3 weeks of elevated aggression. If your tank mates don’t have enough space or cover to stay out of the breeding zone, the peace you’ve built over months falls apart in a day.

Tank Requirements And Water Parameters

A minimum 55-gallon (208 L) tank is the starting point for Blue Acaras in a community setup — a 40 gallon works for just a single specimen or a mated pair without other cichlids, but once you add tank mates, you need the footprint. A 60-gallon breeder or 75-gallon gives you the length and width to create territory breaks with hardscape. Without physical barriers, Blue Acaras will chase tank mates across the entire tank during breeding, and there’s nowhere for other fish to go.

Water parameters: pH 6.5–7.5, temperature 74–82°F (23–28°C), moderate hardness. Use fine sand or rounded gravel — they dig, especially around spawning sites, and sharp substrate damages their barbels over time. Good filtration is non-negotiable with any cichlid. They’re messy eaters and the biological load is higher than most beginners expect.

Reality of Keeping Blue Acaras in a Community Tank

Most of the time, Blue Acaras are model citizens. They swim confidently, they’re visible during the day, and they interact with their surroundings in a way that makes a tank feel alive. They’ll investigate the substrate, move gravel around, and develop distinct personalities. Mine learned feeding patterns faster than most fish I’ve kept — they come to the front of the glass at the same time every day.

The challenge is the unpredictability of breeding cycles. You don’t always see a spawn coming. One day the tank is normal, the next your acara pair is guarding a rock and chasing anything that comes within 10 inches (25 cm). You need tank mates that are either fast enough to stay out of the way or big enough to not be threatened by the chase. This is why bottom-dwellers like corydoras and plecos are such reliable picks — they stay out of the mid-water territory the acara patrols during breeding.

The other reality: Blue Acaras are personable, curious fish that interact with their keeper in ways most community fish don’t. That’s part of the appeal. But you’re keeping a cichlid. Don’t let the calm exterior fool you into ignoring the instincts underneath. In my experience, the shift that catches people off guard isn’t the initial aggression — it’s how fast a previously peaceful pair flips the moment eggs appear. I’ve kept acaras alongside angelfish and corydoras with zero problems for months, then watched the pair clear a 12-inch radius around a flat rock overnight. That switch is normal cichlid behavior, but you need to plan your tank layout around it before it happens, not after.

Biggest Mistake Acara Keepers Make

Adding small fish after the acara is established. Once a Blue Acara is confident in its territory, new additions — especially small ones — are immediately seen as either prey or competition. Adding nano fish to an established acara tank is asking for losses. If you’re building a community with Blue Acaras, stock the tank with the larger fish first and add the acara last. That way it enters as the newcomer, not the established owner, and aggression is more manageable. I’ve watched this play out repeatedly at the stores I managed — customers would come back a week after buying an acara wondering why their smaller fish were disappearing. Nine times out of ten, they’d added the acara to an already-settled tank. Stocking order with cichlids is not a suggestion; it’s the difference between a community tank and a disaster.

21 Best Blue Acara Tank Mates

Finding suitable tank mates for your Blue Acaras requires matching size, temperament, and water parameters. Each entry below includes a compatibility ease score and the key conditions to make the pairing work. We’ll note for each tankmate:

• Scientific Name
• Adult Size
• Water Temperature Range
• Minimum tank size
• Care Level
• Diet
• Origin
• Swimming Level

Expert Take

After 25+ years keeping cichlids and watching how they behave across hundreds of community setups — in my own tanks and in stores I managed — Blue Acaras consistently sit at the more forgiving end of the cichlid spectrum. That changes fast when they spawn, which is why the tank size and stocking advice below isn’t optional. Blue Acaras are one of the best mid-size cichlids for a community tank — if you pick the right community. They’re not as aggressive as most South American cichlids their size, but they’ll defend their territory when threatened and will eat anything small enough to fit in their mouth. The sweet spot is large, robust tank mates that share the same water parameters and give the acara space. The species on this list are ranked by how forgiving they are — choose the 9/10 entries if you’re newer to cichlid keeping, and reserve the 6/10 picks for larger tanks where you can manage territory properly. — Mark Valderrama, AquariumStoreDepot

Species	Adult Size	Min Tank	Ease	Compatibility
Angelfish	4 to 6 inches (10–15 cm)	55 gallons (208 L)	9/10	High
Corydoras Catfish	2 to 3 inches (5–8 cm)	30 gallons (114 L)	8/10	High
Roseline Sharks	4 inches (10 cm)	55 gallons (208 L)	7/10	High
Silver Dollars	6 inches (15 cm)	75 gallons (284 L)	9/10	High
Blood Parrot Cichlid	6 inches (15 cm)	55 gallons (208 L)	9/10	High
Congo Tetra	2.5 – 3.5 inches (6–9 cm)	40 gallons (151 L)	7/10	High
Geophagus	5–8 inches (13–20 cm)	75+ gallons (284+ L)	7/10	High
Clown Loach	12 inches (30 cm)	125+ gallons (473+ L)	7/10	High
Synodontis Catfish	6 inches (15 cm)	40 gallons (151 L)	9/10	High
Severum	8 inches (20 cm)	55 gallons (208 L)	7/10	High
Uaru Cichlids	10 inches (25 cm)	75 gallons (284 L)	7/10	High
Bala Shark	14 inches (36 cm)	125 gallons (473 L)	7/10	High
Firemouth Cichlids	5 to 6 inches (13–15 cm)	55 gallons (208 L)	9/10	High
Jack Dempsey Cichlid	10 inches (25 cm)	75 gallons (284 L)	6/10	Moderate
Medium Sized Gouramis	4–5 inches (10–13 cm)	40 gallons (151 L)	7/10	High
Rainbowfish	4–5 inches (10–13 cm)	55 gallons (208 L)	7/10	High
Bristlenose Pleco	4–5 inches (10–13 cm)	30 gallons (114 L)	9/10	High
Zebra Loach	3.5 inches (9 cm)	30 gallons (114 L)	9/10	High
Pictus Catfish	3–5 inches (8–13 cm)	75 gallons (284 L)	6/10	Moderate
Giant Danio	4 inches (10 cm)	40 gallons (151 L)	9/10	High
Convict Cichlid	6 inches (15 cm)	55 gallons (208 L)	6/10	Moderate

1. Angelfish

Ease: 9/10 — One of the safest choices for this tank setup.

• Scientific Name: Pterophyllum scalare
• Adult Size: 4 to 6 inches (10–15 cm)
• Water Temperature: 75–82°F (24–28°C)
• Minimum tank size: 55 gallons (208 L)
• Care Level: Easy
• Diet: Omnivore
• Origin: Amazon River
• Swimming Level: All

Angelfish are one of the cleanest pairings you’ll find with Blue Acaras. Same South American origin, overlapping water parameters, and similar size means the acara doesn’t see them as prey or rival. They share mid-water zones without competing directly for territory. The one caveat: both species get semi-territorial when breeding. If they both breed at the same time, separate breeding zones or a larger tank is mandatory. In a 75-gallon (284 L) or bigger, this is rarely an issue.

2. Corydoras Catfish

Ease: 8/10 — Excellent bottom-dweller pairing, but size matters.

• Scientific Name: Corydoras spp.
• Adult Size: 2 to 3 inches (5–8 cm)
• Water Temperature: 72–79°F (22–26°C)
• Minimum tank size: 30 gallons (114 L)
• Care Level: Moderate
• Diet: Omnivore
• Origin: South America
• Swimming Level: Bottom

Corydoras Catfish are one of my go-to pairings with Blue Acaras. They stay on the bottom, don’t compete for the acara’s territory, and their armored bodies give them some protection from occasional cichlid harassment. Stick with larger cory species — sterbai, duplicareus, or adolfoi — that reach 2.5–3 inches (6–8 cm). Smaller species like pygmy corys stay too small and risk being eaten as the acara grows. Keep them in groups of 6 or more, with soft sandy substrate so they can forage properly.

3. Roseline Sharks

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Sahyadria denisonii
• Adult Size: 4 inches (10 cm)
• Water Temperature: 60–77°F (16–25°C)
• Minimum tank size: 55 gallons (208 L)
• Care Level: Moderate
• Diet: Omnivore
• Origin: India
• Swimming Level: Mid level

Roseline Sharks are fast, active schooling fish with a striking red and silver stripe pattern. Their speed is their best protection — they’re quick enough to avoid acara aggression and large enough not to be mistaken for food. Keep them in groups of 6 or more; a lone Roseline is a stressed Roseline. The temperature overlap with Blue Acaras is workable but check your parameters — Roselines prefer the cooler end of the range (72–76°F / 22–24°C), so aim for that middle ground rather than keeping it warm for the acara.

4. Silver Dollars

Ease: 9/10 — One of the safest choices for this tank setup.

• Scientific Name: Metynnis argenteus / Metynnis hypsauchen
• Adult Size: 6 inches (15 cm)
• Water Temperature: 75–82°F (24–28°C)
• Minimum tank size: 75 gallons (284 L)
• Care Level: Easy
• Diet: Herbivore/Omnivore
• Origin: South America
• Swimming Level: Mid to top

Silver Dollars work so well with Blue Acaras because they occupy completely different parts of the tank and pose zero threat to each other. They’re too big to be eaten, too fast to be caught if chased, and too herbivorous to compete for the same food. The downside is they’re plant destroyers — a planted tank with Silver Dollars is a dead planted tank. This pairing works best in a South American biotope with driftwood and rocks but no live plants.

5. Blood Parrot Cichlid

Ease: 9/10 — One of the safest choices for this tank setup.

• Scientific Name: Hybrid
• Adult Size: 6 inches (15 cm)
• Water Temperature: 72–82°F (22–28°C)
• Minimum tank size: 55 gallons (208 L)
• Care Level: Easy
• Diet: Omnivore
• Origin: Captivity
• Swimming Level: All levels

Blood Parrot Cichlids are a surprisingly good pairing with Blue Acaras. They’re similar in size, similarly mellow for cichlids, and they don’t typically challenge each other for territory. Blood Parrots can’t fully close their mouths (a trait of their hybrid genetics), so they’re less capable of inflicting damage during confrontations compared to other cichlids. The main watch point: breeding season. Both species get territorial when spawning, so tank size and territory breaks matter. In a 55-gallon (208 L) or larger with multiple sight breaks using rocks and driftwood, they coexist reliably.

Hard Rule: Never pair Blue Acaras with fish under 3 inches (8 cm). Adult Blue Acaras reach 6–7 inches (15–18 cm) and will eat smaller companions — especially at feeding time when everything in the tank is moving and prey-response instincts kick in. This applies even to fish that seemed safe when the acara was young.

6. Congo Tetra

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Phenacogrammus interruptus
• Adult Size: 2.5–3.5 inches (6–9 cm)
• Water Temperature: 73–82°F (23–28°C)
• Minimum tank size: 40 gallons (151 L)
• Care Level: Moderate
• Diet: Omnivore
• Origin: Democratic Republic of Congo
• Swimming Level: Middle to Top

Congo Tetras are one of the larger tetra species, and that size is what makes them work here. At 3–3.5 inches (8–9 cm), they’re at the borderline of “too small for an acara tank” — so you need a group of at least 8–10, a well-planted tank with dense midwater vegetation, and ideally an acara that was introduced after the tetras were established. Their flowing fins are a concern with any cichlid; watch for fin nipping and remove the acara if damage starts. In the right setup, Congo Tetras add a stunning flash of color above the acara’s territory level.

7. Geophagus

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Geophagus spp.
• Adult Size: 5–8 inches (13–20 cm)
• Water Temperature: 76–83°F (24–28°C)
• Minimum tank size: 75+ gallons (284+ L)
• Care Level: Moderate
• Diet: Omnivore
• Origin: South America
• Swimming Level: Middle to Bottom

Geophagus are another South American cichlid, which is both the advantage and the complication. They share the acara’s biotope preferences, so water conditions align naturally. But two cichlid species sharing bottom territory in the same tank can produce conflict, especially during breeding. In a 75-gallon (284 L) or larger with a deep sand bed and multiple rock piles to separate territories, they coexist reliably. In anything smaller, expect territorial disputes. Both species also rearrange the substrate constantly, which stresses other bottom-dwellers — plan accordingly.

8. Clown Loach

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Chromobotia macracanthus
• Adult Size: 12 inches (30 cm)
• Water Temperature: 75–86°F (24–30°C)
• Minimum tank size: 125+ gallons (473+ L)
• Care Level: Moderate
• Diet: Omnivore
• Origin: Indonesia
• Swimming Level: Bottom

Clown Loaches grow much larger than most hobbyists expect — 12 inches (30 cm) is a real adult size, not the 4-inch (10 cm) fish you see in the store. That size ultimately makes them excellent Blue Acara companions: they’re too large to be threatened, they stay primarily on the bottom, and their gregarious nature keeps them in a social group rather than competing for territory. You need a 125-gallon (473 L) or larger to do this combination right. Keep a group of 5+ Clown Loaches — singles and pairs stress out and become more aggressive. In a large tank, this is one of the most visually impressive combinations you can build.

9. Synodontis Catfish

Ease: 9/10 — One of the safest choices for this tank setup.

• Scientific Name: Synodontis alberti
• Adult Size: 6 inches (15 cm)
• Water Temperature: 72–82°F (22–28°C)
• Minimum tank size: 40 gallons (151 L)
• Care Level: Easy
• Diet: Omnivore
• Origin: Republic of Congo
• Swimming Level: Bottom

Synodontis Catfish are one of the most reliable pairings for any medium-to-large cichlid tank. They’re armored, they don’t compete for mid-water territory, and most Synodontis species are large enough at 5–6 inches (13–15 cm) to not be eaten. They’re nocturnal by nature, which means they’re active when the Blue Acara is resting — two fish that barely cross paths. In 25 years of keeping cichlids, Synodontis is one of my default bottom-dweller picks for exactly this reason. They just work.

10. Severum

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Heros severus
• Adult Size: 8 inches (20 cm)
• Water Temperature: 75–84°F (24–29°C)
• Minimum tank size: 55 gallons (208 L)
• Care Level: Moderate
• Diet: Omnivore
• Origin: South America
• Swimming Level: Bottom to mid

Severums are mellow for their size — one of the calmer South American cichlids at 8 inches (20 cm). They work with Blue Acaras because neither species actively seeks confrontation outside of breeding. The 7/10 rating reflects the two-cichlid complexity: when both spawn simultaneously, territory disputes escalate. In a 75-gallon (284 L) or larger with clearly defined territory zones, Severums and Blue Acaras can be one of the most impressive South American community pairings you’ll build. Choose this over Geophagus if you want a cichlid companion that’s slightly easier to manage at smaller tank sizes.

11. Uaru Cichlids

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Uaru amphiacanthoides
• Adult Size: 10 inches (25 cm)
• Water Temperature: 80–84°F (27–29°C)
• Minimum tank size: 75 gallons (284 L)
• Care Level: Moderate
• Diet: Herbivore
• Origin: South America
• Swimming Level: Bottom to mid

Uaru Cichlids are peaceful herbivores, but they run warm — 80–84°F (27–29°C) is their preferred range, which pushes into the upper end of what Blue Acaras tolerate. If your tank sits at 78–80°F (26–27°C), this pairing works. They’re large enough to not be threatened by the acara, and their herbivorous diet means no food competition. They’ll eat every live plant in the tank. Don’t set up a planted aquarium with Uarus in it — plan for driftwood, rocks, and maybe some java fern tied to wood if you want any greenery at all.

12. Bala Shark

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Balantiocheilos melanopterus
• Adult Size: 14 inches (36 cm)
• Water Temperature: 75–82°F (24–28°C)
• Minimum tank size: 125 gallons (473 L)
• Care Level: Moderate
• Diet: Omnivore
• Origin: Southeast Asia
• Swimming Level: Mid to top

Bala Sharks get large — 14 inches (36 cm) is real — which makes them too big to be threatened by any Blue Acara. The pairing works well in terms of temperament: Bala Sharks are skittish and non-aggressive, so they don’t provoke the acara. They need a group of 3 or more and a 125-gallon (473 L) minimum to be kept properly. This is a commitment. If you’re building a large South American or mixed Asian/South American display tank, Bala Sharks make a dramatic addition above the acara’s territory zone.

13. Firemouth Cichlids

Ease: 9/10 — One of the safest choices for this tank setup.

• Scientific Name: Thorichthys meeki
• Adult Size: 5 to 6 inches (13–15 cm)
• Water Temperature: 75–86°F (24–30°C)
• Minimum tank size: 55 gallons (208 L)
• Care Level: Easy
• Diet: Omnivore
• Origin: Central America
• Swimming Level: Mid to bottom

Firemouth Cichlids are a great match for Blue Acaras in terms of size, temperament, and care requirements. Both are medium-sized cichlids that display territorial behavior during breeding but remain manageable outside of spawning periods. The 9/10 rating reflects how reliably this pairing works in a properly sized tank. In a 55-gallon (208 L) with territory breaks, both species establish their own zones and generally respect the boundary. When both pairs spawn simultaneously, you need the tank to be larger — 75 gallons (284 L) is where this pairing becomes truly comfortable.

14. Jack Dempsey Cichlid

Ease: 6/10 — Works, but requires more careful management.

• Scientific Name: Rocio octofasciata
• Adult Size: 10 inches (25 cm)
• Water Temperature: 75–86°F (24–30°C)
• Minimum tank size: 75 gallons (284 L)
• Care Level: Intermediate
• Diet: Omnivore
• Origin: Central America
• Swimming Level: All levels

Jack Dempsey Cichlids are significantly more aggressive than Blue Acaras. They can live together, but the 6/10 score is there for a reason — you’re pairing one of the calmer cichlids with one of the more aggressive ones, and the Jack Dempsey will bully the Blue Acara if the tank isn’t large enough. A 75-gallon (284 L) bare minimum, 100-gallon (379 L) preferred. Heavy hardscape to break sightlines is non-negotiable. Choose a Firemouth or Severum instead if you want a cichlid companion that’s easier to manage — Jack Dempseys are better suited to dedicated cichlid-only aggression tanks.

15. Medium Sized Gouramis

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Trichopodus spp.
• Adult Size: 4–5 inches (10–13 cm)
• Water Temperature: 75–82°F (24–28°C)
• Minimum tank size: 40 gallons (151 L)
• Care Level: Intermediate
• Diet: Omnivore
• Origin: Southeast Asia
• Swimming Level: Mid to top

Medium-sized gouramis — specifically Pearl Gouramis and Gold Gouramis — can work with Blue Acaras, but they’re not a slam dunk. Gouramis are slow-moving, and slow-moving fish in a cichlid tank draw attention. The pairing works best with a well-planted tank where gouramis can find cover at the surface and mid levels, away from the acara’s primary territory zone. Pearl Gouramis are the best pick of the group: they’re the largest, the most mellow, and the most likely to hold their own if the acara gets territorial. Avoid dwarf gouramis — they’re too small and too fragile for this setup.

16. Rainbowfish

Ease: 7/10 — Good choice with a few conditions to watch.

• Scientific Name: Melanotaenia boesemani
• Adult Size: 4–5 inches (10–13 cm)
• Water Temperature: 72–77°F (22–25°C)
• Minimum tank size: 55 gallons (208 L)
• Care Level: Intermediate
• Diet: Omnivore
• Origin: Indonesia
• Swimming Level: Middle

Rainbowfish are fast, active schooling fish that stay large enough to be safe with Blue Acaras at 4–5 inches (10–13 cm). Keep a group of at least 6 — solitary rainbowfish stress out and become targets. The temperature mismatch is worth noting: Rainbowfish prefer 72–77°F (22–25°C), which is cooler than the acara’s ideal range of 74–82°F (23–28°C). A compromise around 76°F (24°C) keeps both happy. In a large, open-water tank, Rainbowfish add a stunning flash of color at mid levels while the acara works the bottom — complementary without competing.

17. Bristlenose Pleco

Ease: 9/10 — One of the safest choices for this tank setup.

• Scientific Name: Ancistrus cirrhosus
• Adult Size: 4–5 inches (10–13 cm)
• Water Temperature: 73–80°F (23–27°C)
• Minimum tank size: 30 gallons (114 L)
• Care Level: Easy
• Diet: Herbivore
• Origin: Amazon
• Swimming Level: Bottom

Bristlenose Plecos are one of the most reliable tank mates for any medium cichlid, and Blue Acaras are no exception. They’re armored, algae-eating, non-territorial, and they stay on the glass and surfaces rather than competing in the acara’s bottom territory zone. At 4–5 inches (10–13 cm) they’re large enough to be ignored. Provide caves and driftwood — Bristlenose Plecos need wood as part of their diet and will claim a cave as their own, which also keeps them out of the acara’s way. This is probably my most-recommended pairing for beginners to the Blue Acara — simple, effective, and the pleco actively improves the tank by keeping algae down.

18. Zebra Loach

Ease: 9/10 — One of the safest choices for this tank setup.

• Scientific Name: Botia striata
• Adult Size: 3.5 inches (9 cm)
• Water Temperature: 73–79°F (23–26°C)
• Minimum tank size: 30 gallons (114 L)
• Care Level: Easy
• Diet: Omnivore
• Origin: India
• Swimming Level: Bottom

Zebra Loaches are a hidden gem for Blue Acara tanks. They’re small at 3.5 inches (9 cm), which makes them borderline for size, but they’re armored loaches — not soft-bodied fish — and they’re fast enough and bottom-focused enough to stay out of trouble. Keep them in groups of 5 or more, and they’ll school together on the bottom while the acara occupies mid-territory. Their striking black and white stripe pattern also adds visual contrast in the lower tank zones. Stable water conditions are key; loaches are sensitive to water quality swings.

19. Pictus Catfish

Ease: 6/10 — Works, but requires more careful management.

• Scientific Name: Pimelodus pictus
• Adult Size: 3–5 inches (8–13 cm)
• Water Temperature: 75–82°F (24–28°C)
• Minimum tank size: 75 gallons (284 L)
• Care Level: Intermediate
• Diet: Omnivore
• Origin: South America
• Swimming Level: Bottom

Pictus Catfish are active, fast, and attractive — but they’re schooling fish that need groups of 4 or more to behave well, and they have long barbels that get damaged in tanks with rough gravel or cichlid harassment. The 6/10 score reflects the management required: a 75-gallon (284 L) minimum, soft substrate, and an established acara that isn’t in breeding mode. In the right setup they’re one of the most visually active bottom-dwellers you can keep. In the wrong setup, fin and barbel damage becomes a chronic problem. Choose a Synodontis over Pictus if tank management isn’t your strong suit.

20. Giant Danio

Ease: 9/10 — One of the safest choices for this tank setup.

• Scientific Name: Danio aequipinnatus
• Adult Size: 4 inches (10 cm)
• Water Temperature: 72–75°F (22–24°C)
• Minimum tank size: 40 gallons (151 L)
• Care Level: Easy
• Diet: Omnivore
• Origin: India
• Swimming Level: All

Giant Danios are the only danio species I’d recommend for a Blue Acara tank — standard danios like zebras and leopards are too small and will be eaten. Giant Danios reach 4 inches (10 cm) and are fast enough to stay out of trouble. They’re active, visible schooling fish that work upper water levels while the acara occupies bottom to mid. Keep a group of 6 or more. Their temperature preference (72–75°F / 22–24°C) runs cooler than the acara’s ideal, so aim for 74–76°F (23–24°C) as a compromise — workable for both, ideal for neither, but a healthy middle ground.

21. Convict Cichlid

Ease: 6/10 — Works, but requires more careful management.

• Scientific Name: Amatitlania nigrofasciata
• Adult Size: 6 inches (15 cm)
• Water Temperature: 74–84°F (23–29°C)
• Minimum tank size: 55 gallons (208 L)
• Care Level: Easy
• Diet: Omnivore
• Origin: Central America
• Swimming Level: Midwater

Convict Cichlids can live with Blue Acaras — both are similar in size and neither dominates the other in most setups. The 6/10 rating is there because Convicts breed prolifically. A spawning Convict pair is one of the most aggressively territorial fish in the hobby, pound for pound. When Convicts are protecting fry, they’ll challenge fish much larger than themselves — including Blue Acaras. In a large tank with clear territory breaks, this can work. In anything under 75 gallons (284 L) with a breeding pair of Convicts, the aggression becomes unmanageable. Know what you’re signing up for before adding Convicts to a community setup.

Tips for Creating a Harmonious Tank

Here’s the thing that will make or break every pairing on this list: tank size. More gallons buys you more peace. It really is that simple. And the second variable is hardscape — rocks, driftwood, anything that breaks sightlines so fish can get out of each other’s view. Here’s what to actually focus on:

• Add the acara last. Establish other fish first. When the acara enters an already-occupied tank, it’s the newcomer — aggression is far more manageable than when the acara is the established owner and new fish are introduced into its territory.
• Break sightlines with hardscape. Rocks, driftwood, and dense planting create visual barriers so fish can’t see each other across the entire tank. A fish that’s out of sight isn’t being chased. This is the single most effective aggression reducer in any cichlid tank.
• Watch the breeding cycles. When a Blue Acara pair spawns, the aggression radius expands immediately. You’ll see it — the pair clusters around a flat surface and starts chasing everything nearby. Have a plan: a spare tank, or a large enough main tank where other fish can flee. Don’t wait until something is injured.
• Consider a solo acara. A single Blue Acara as a centerpiece fish in a community tank with no breeding partner eliminates the aggression spike entirely. It’s not uncommon and it simplifies tank mate selection considerably.

Mark’s Pick: Bristlenose Pleco plus a group of 6+ Corydoras sterbai (or duplicareus) on the bottom, with a school of 8+ Congo Tetras or Giant Danios in the mid-to-upper levels. The bottom crew handles cleanup and stays out of the acara’s territory, the upper school adds movement and color without competing. It’s a clean, reliable stack that works for both planted tanks and biotope setups — and the cory group adds enough bottom activity that the acara doesn’t fixate on any single tank mate.

Should You Set Up a Blue Acara Community Tank?

Blue Acara vs. Firemouth vs. Severum — Which South American Cichlid Is Right for You?

These three come up in the same conversation constantly. If you’re debating between them, here’s my honest take:

• Blue Acara: the best color of the three, the most community-friendly, and workable in a 55-gallon (208 L). This is the one I’d tell most people to start with — cichlid personality without needing an all-cichlid tank.
• Firemouth: calmer, easier to manage during breeding, more forgiving in moderately hard water. Less dramatic than the Acara, but if you’re genuinely new to cichlid keeping, the Firemouth gives you more margin for error.
• Severum: when you want a bigger statement fish and have the tank for it — 75+ gallons (284+ L). Surprisingly mellow for its size. The heavyweight option if you’re building a South American display tank and want one fish that fills the frame.

Good Fit If:

• You have a 55-gallon (208 L) or larger tank with hiding spots, caves, and hardscape territory breaks
• You keep medium-to-large fish that can hold their own or avoid the acara’s attention
• You want a South American biotope community with compatible water parameters (pH 6.5–7.5)
• You’re adding the acara last, after other fish are established in the tank
• You’re prepared to manage breeding-season aggression — either with a larger tank or a breeding partition

Avoid If:

• You have small fish under 3 inches (8 cm) — they’ll be eaten as the acara matures, even if they’re safe at first
• You want a fully peaceful community — Blue Acaras have breeding-season aggression that affects the whole tank
• You keep delicate, slow-moving, or nervous fish that don’t handle cichlid presence well
• Your tank runs hard and alkaline — Blue Acaras need soft to moderately hard water at neutral to slightly acidic pH
• Your tank is under 55 gallons (208 L) and already has established fish — adding an acara to a crowded small tank is a recipe for injury

Frequently Asked Questions

Closing Thoughts

The Blue Acara is one of the few cichlids where you actually get to build a real community — not just a cichlid tank with one dominant fish and everyone else surviving around it. Most South American cichlids at this size are too aggressive for that. The Blue Acara isn’t. Get the tank size right, add the acara last, break up the sightlines with hardscape, and plan for the breeding cycle before it happens. Do those four things, and this fish rewards you with color, personality, and a tank that actually functions as a community — not just a truce.

The Blue Acara is the best argument I know for giving cichlids a chance if you’ve been afraid to try them.

Have you kept Blue Acaras in a community tank? Drop your experience in the comments — we always want to hear what’s working (and what isn’t) from hobbyists in the field.

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