Best Reef Salt Mix - Choosing the Best Salt For Your Tank (2020 Reviews 🏅)

June 23, 2019

Best Reef Salt Mix - Choosing the Best Salt For Your Tank (2020 Reviews 🏅)

Discussing the best reef salt mixes is always a passionate discussion among reefers and saltwater aquarists. Some people swear by one brand of salt mix while others will go out of their way to talk about why this salt mix brand is way better than others. The purpose of this post today is to just lay out the facts and finding what salt mix will work for you and your budget. I want to get around all the marketing fluff and just tell you what works for your tank and needs. So let's get started.

The Best Salt Mix Is The One Closest To Your Ideal Parameters

This is the very first statement I'm going to lay out for you. This relates most to reef tank owners. Every tank needs are different depending on the type of corals you have. For example, SPS corals like Acropora are going to need different parameters and trace elements vs. say a softie tank. Softie and LPS tanks can tolerate more swings so going with a mix with a high alkalinity isn't going to hurt you. However, for a Acropora heavy tank, many reefers like to keep their alkalinity lower in order to keep it more stable and closer to natural sea water. There there is of course fish only and fish only with live rock (FOWLR) setups. Fish only aquariums are not going to need an expensive or advanced salt mix so a budget mix will do the job. Same can be said with a FOWLR tank.

Synthetic Versus Mined Reef Salt Mixes

Sea Salt Mines

In the list I'm going to provide (a quick note that there will be affiliate links below and Aquarium Store Depot may collect a share of sales or other compensation from the links on this page (learn more), you will see that I label each mix for you as synthetic or mined. Mined reef salt mixes come from the mined evaporated seawater ocean deposits. Others will be pulled from the ocean like Red Sea Salt. There is also mainly synthetic made salt, which tends to be very popular in Europe. Salt mixes that are mostly or 100% synthetic represent some of the highest quality and most expensive reef salt mixes in the market.

Reef Aquarium Salt Mix Parameters And Major Elements

Let's talk about the main parameters that make up a reef salt mix.

  • Calcium - This is the major foundation of the reefs. Through a process called biominealization, corals skeletons are created. Without calcium, hard corals cannot continue to build and maintain their skeletons.
  • Alkalinity - Alkalinity is related to pH but also gives us awareness of available bicarbonate in our tanks. Without a stable alkalinity level, our corals will not have the fuel to build their skeletons. Stable alkalinity will also prevent pH fluctuations. Calcium and Alkalinity closely relate to each other as dosing calcium will reduce alkalinity so keeping a balance is essential if you are having to dose elements. This is why two-part solutions are so common in reef tanks.
  • Magnesium - Magnesium is the catalyst of the reef. They ensure alkalinity, calcium, and various other element can interact with each other. It doesn't need to be dosed as often, but if it is out of wack, the your corals tend to start suffering.

There are many other trace elements I can discuss, but for most aquarists, these are the big 3 we concern ourselves with and test for in our reef tanks.

Best Salt For Reef Tank

Now let's talk about the reef salt mixes themselves. Below is a list of the best reef salt mixes available today.

Picture Name Best For Type Links
Brightwall Aquatics Neomarine Salt Brightwell Aquatics Neomarine Salt SPS Tanks Synthetic

Fritz Reef Pro Mix Salt Fritz Reef Pro Mix LPS & Mixed Reefs Mined

Instant Ocean Sea Salt Instant Ocean Sea Salt Fish Only Tanks Mined

Instant Ocean Reef Crystals Reef Salt Instant Ocean Reef Crystals Mixed Reefs Mined

Red Sea Coral Pro Salt Red Sea Coral Pro Salt SPS Tanks Mined

Tropic Marin Pro Reef Salt Tropic Marin Pro Reef Salt SPS Tanks Synthetic

Best Reef Salt Reviews 

1. Brightwell Aquatics Neomarine Salt - The Salt of Choice For Worldwide Corals

Brightwell Aquatics Neomarine Salt Reviews

I've recommended Brightwell Aquatics products in the past like their Neophos and Mircobacter 7. The founder of Brightwell is the former owner of Kent Marine and their products are extensively researched and tested over a multi-year period. The Brightwell NeoMarine Salt is so well regarded, that it is the reef salt of choice for World Wide Corals, one of the major coral sellers in the United States. 

NeoMarine Salt not only has all the essential elements of a saltmix, but also does not have anti-caking agents. Anti-caking agents tend to turn your saltwater holding buckets and vats brown over time. What I feel separates NeoMarine from other salt mixes aside from their research and efforts are the parameters of the salt.

Many reef salt mixes you will see on this list will have evaluated Alkalinity. NeoMarine has a lower Alkalinity, which is great for SPS tanks. SPS tanks need to have extremely stable levels in the aquarium and having a mix with evaluated ALK can be catastrophic as the Alkalinity levels can spike after a water change. This mix is perfect as you can dose to 7.5 - 8.0 and not worry about a water change completely throwing off your key parameters. 


  • Alkalinity - 7.5 DKH
  • Calcium - 413 PPM
  • Magnesium - 1290 PPM


  • Low ALK is perfect for SPS tanks
  • Salt mix package is measure at 35 PPM - you will actually get the volume stated on the box
  • Used by big coral dealers


  • Expensive
  • Low ALK can be a disadvantage for those who don't dose (e.g. - nanoreef tanks)
  • Hard to find locally

Best For: SPS Tanks

2. Fritz Reef Pro Mix - Readily Available Quick Mixing Salt

Fritz Reef Pro Mix Salt

If you follow reef YouTubers around, you likely have heard of Fritz Reef Pro Mix. Fritz has a big marketing machine that sponsors a lot of YouTubers and they tend to be everywhere at the local fish stores. While they are everywhere, this is not the best reef salt mix on the list. It's mostly on here because it's so readily available at local fish stores and they regularly go on sale where you can purchase boxes at huge discounts.

The main advantage with Fritz Reef Pro Mix is that it mixes very fast. I would say the mix time is around that of Brightwell's product. For a mixed reef and smaller reef tanks I would say this is a great salt mix for you. However, if you are serious about Acropora corals, I would steer away from this mix.

This is because it is well documented that Fritz has had quality control issues in the past. When they first went to market, there were some batches with different Alkalinity numbers. I have also seen a few mixes that have failed ICP tests with several parameters being too low. Given those reasons, I would not recommend this mix for Acroporas.

It is readily available at the local fish stores and online though, meaning you won't have to worry about getting your normal salt mix in a pinch if you need to get it locally.


  • Alkalinity - 8.0 - 8.5 DKH
  • Calcium - 400-450 PPM
  • Magnesium - 1300-1400 PPM


  • Quick mixing and no caking agents
  • Readily available online and locally
  • Tends to go on sale locally


  • Expensive
  • Bad quality control history

Best For: LPS and Mixed Reef Tanks

3. Instant Ocean Sea Salt - Best Salt For Fish Only Tanks

Instant Ocean Salt Mix Review

Instant Ocean Sea Salt is the most used sea salt in the world. Used by hobbyists, public aquariums, and research facilities. Instant Ocean has been a mainstay in the industry for over 50 years. They have created the benchmark for the industry and quality control standards. No other salt on the market has the history and field results of proven usage then the Instant Ocean brand.

That being said, this particular mix is made for fish only tanks. It does not have the evaluated levels and trace elements that Reef Crystals have. However, it is a great salt mix for those with fish only, fish only with live rock, and soft coral dominated tanks. The mix also has anti-caking agents which will turn your buckets and holding vats brown over time with crud making non-ideal to use for those who like to store saltwater.


  • Alkalinity - 11 DKH
  • Calcium - 400 PPM
  • Magnesium - 1350 PPM


  • Cheap
  • Readily available everywhere
  • Great quality control and proven field results


  • Lacks evaluated levels and elements for hard coral heavy reef tanks
  • Anti-caking agents

Best For: Fish Only Tanks

4. Instant Ocean Reef Crystals - A Budget Friendly Reef Salt

Instant Ocean Reef Crystals Salt Mix

Instant Ocean Reef Crystals Reef Salt is the budget friendly reef salt for many of us with reef tanks. It is also the most readily available reef salt on the market so if you are in a rush or bind it's very easy to get locally even from a chain pet store. It's the same quality and field tested Instant Ocean salt we are familiar with the industry, but with a better formula designed for mixed reef tanks.

There are many incredible looking reef tanks that use this salt and you will save some money using it over the other brands. There are a few cons here though. The first thing is the anti-caking agents in the salt mix. If you keep water changing stations or store saltwater there is a high likelihood that the agents will eventually encrust your containers with brown crud. This is really annoying to clean and can lead you to having to replace containers. The other issue is the evaluated alkalinity of the mix. As high as 13, which can be disastrous to an SPS tank after a water change. This salt will work great for softy and LPS tanks that can take the swings better, but you run the risk of problems after water changes with this mix with sensitive SPS corals like Acros.


  • Alkalinity - 13 DKH
  • Calcium - 490 PPM
  • Magnesium - 1440 PPM


  • Cheap for a reef salt mix
  • Readily available everywhere
  • Great quality control and proven field results


  • High alkalinity makes this not safe for Acro heavy tanks
  • Anti-caking agents

Best For: Mixed Reef Tanks

5. Red Sea Pro Coral Salt - Salt Made From the Actual Red Sea

Red Sea Coral Pro Salt

Red Sea Coral Pro Salt is about as close as you can get from natural sea water from how they formulate their mix. The salt is collected from the Red Sea. This produces an all natural eco-friendly mix that is one of the best mixes in the industry. You can learn more about their process in the video below: 

Red sea coral pro salt is one of the more trusted mixes used by frag sellers and SPS stick heads. There are actually two mixes Red Sea sells. The pro mix has higher alkalinity while the regular Red Sea mix has lower alkalinity. Both work great, but I would lean on the regular mix if you have a heavy SPS tank for better Alkalinity stability. 

The main issue with the Red Sea salt mix is it's availability.  Chain stores do not carry it and you will mostly see higher end local fish stores that specialize in marine livestock carry them.


  • Alkalinity - 12.2 DKH
  • Calcium - 450 PPM
  • Magnesium - 1340 PPM


  • Naturally harvested
  • Two choices with regular and pro depending on what alkalinity you desire
  • Great quality control and brand name


  • Expensive
  • Hard to find locally

Best For: SPS Tanks

6. Tropic Marin Pro Reef Salt - The Best Reef Salt For SPS Tanks

Tropic Marin Pro Reef Salt

Tropic Marin Pro Reef Salt is the best salt mix you can purchase for your reef tank available on the market today - period. It is formulated with pharmaceutical level ingredients and one of the fully synthetic salt mixes on this list (Brightwell being the other).  

Tropic Marin is a brand you may not see regularly at the local fish store or chain stores, but they have been a major name brand all across the world, particularly in Europe. 

The pro reef salt has the most ideal big three parameters for SPS tanks. The parameters out of the boxes are perfect and makes it very safe to make water changes so you don't have to worry about swings when you make a water change. The stability and quality control of this mix makes this pretty much a must for those with the most demanding corals like Acroporas.

It's the most expensive salt in the mix, but if you have prized designer SPS corals, this is the mix you will want in your reef tank.


  • Alkalinity - 8.5 DKH
  • Calcium - 450 PPM
  • Magnesium - 1380 PPM


  • Pharmaceutical level ingredients 
  • Perfect big 3 parameters out of the box
  • Guarantees ALL 70 trace elements found in seawater 
  • Great quality control and brand name


  • Expensive
  • Hard to find locally

Best For: SPS Tanks

Reef Salt FAQs

Below is a list of common questions I get asked. Hopefully these answer your questions.

What is the Best Reef Salt To Use?

It actually depends on your reef tank setup and the corals you keep. A soft coral dominated tank will not have as much needs as a Heavy SPS tank. If you are just getting started out, you cannot go wrong with the Instant Ocean Reef Crystals salt as this will work for most reef tanks including mixed reefs. But let's go further into the question.

How To Chose A Reef Salt Mix

This is where we start getting into details. What type of tank do you have and making sure you dose to what your salt mix is. There are even tanks where people do not dose, so a mix with evaluated parameters will make the most sense for those people. Nano reef tanks are good candidates for a salt mix with higher parameters since they sometimes are not dosed as they rely on water changes to get parameters back up.

Where Should I Purchase My Reef Salt Mix?

It's a known face in our hobby that most retailers lose money selling salt, especially online retailers as the shipping cost is very high in comparison to other dry goods. This means there are two ideal places to purchase your salt mix. At your local fish store, where your fish store gets salt in pallets so they don't lose money or on an online merchant like Amazon where you know you are not making the retailer lose money shipping the box or bucket of salt to you. 

This is the main reason I stopped selling salt mixes online. It's just not worth taking the losses to ship them.

How Do I Mix Saltwater For My Aquarium?

It's actually easier than you think. The main thing since I'm going to assume that you are planning to do a reef tank or fish only with live rock setup is that you use RODI water made from an RODI System. You will want to use at least a Refractometer along with 35 PPM calibration fluid to ensure you have the right salinity. Keep in mind that the temperature of your water matters when measuring your salinity so try to make sure your temperature is close to the ideal temperature using an Aquarium Heater to bring the water inside your home if you need to cool it down.

Once you have the RODI water at the correct temperature you will want to put in circulation from an Aquarium Wavemaker or Aquarium Return Pump. Then put in your salt according to the manufacturer's instructions until you get to 35 PPM (or 1.026). You will want to wait at least 20-30 minutes every time you have to add salt in when testing your salinity. After you have the salt at the correct salinity, let it mix in the container. I usually let it mix overnight and test the salinity again because I do my water changes.

Below is a video from Raising Reef with better visual introductions and with directions for those of you who like to use water changing stations or store water. This is one of the more detailed videos on the net that describes the process so give him a sub and like if you like the video.

What is the Best Reef Salt Mix (Our Recommendation)?

It really depends on what corals you are planning to keep. There is a quick list for you depending on your needs below:

Conclusion (Best Reef Salt Mixes)

I hope this article helps with figuring out what salt mix works best for you. I always recommend to my clients that they need to dose their tank to their salt mix. So follow the parameters listed on the mixes and dose to those levels. You do not have to follow that guideline if you purchase a mix with an evaluated level of Alkalinity, but you will likely want to still regularly check your levels and make sure you do not drop below 8 DKH. If you have any questions, please leave them in the comments. Thanks for reading.



    Leave a comment

    Comments will be approved before showing up.

    Also in The blog

    Best Aquarium Air Pump
    Best Aquarium Air Pumps - 2020 Reviews and Guide

    March 09, 2020

    Aquarium Air Pumps are great tools for adding oxygen in your aquarium. They are simple, cheap, easy to install and operate, and readily available to purchase. They also can really come in handy in the event of a power outage. I feel every freshwater tank should have an air pump solution. Air pumps are great for your display tank as a source of oxygen delivery. They are also great for backup purposes in the event of a power outage.

    View full article →

    Gold Fish Tank
    Goldfish Tank - Your Guide To Successful Goldfish Care

    February 29, 2020

    The Goldfish is one of the most popular fish in our aquarium hobby. It may even have been the first fish you had when you first got introduced to aquariums. You may have even come across this article thinking about setting up a Goldfish tank for the first time or for a loved one. They really are an amazing fish that are also easily misunderstood. Because they are usually a first-time fish, a number of us enter into Goldfish care and keeping with little knowledge on what is needed to have them thrive.

    View full article →

    Betta Fish Care
    Betta Fish Care - Create A Thriving Betta Tank

    February 09, 2020

    The Betta Fish for some of us fish keepers was our first experience with a pet fish. It was our introduction into this wonderful world of aquarium keeping. Betta Fish after all have a lot going for them that make them great pets. They have a great personality and come in a variety of colors. They can exist in smaller tanks and can be relatively hardy as long as the environment is properly cared for. 

    View full article →