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Instant Ocean

Instant Ocean Reef Crystals Reef Salt for Reef Aquariums, 200 Gallons

  • Based on 5,998 reviews
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Availability: In Stock.
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Arrives Oct 20 – Oct 21
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Size: 200-Gallon


Pattern Name: Aquarium Pond Water Treatment


Features

  • Contains essential ocean reef elements in concentrations greater than those found in natural sea water
  • Recommended specific gravity range 1.020-1.026 at 77o F | Note 1.4 lbs. of Reef Crystals is formulated to create 5 gallons of saltwater at a specific gravity of 1.024
  • Our marine salt will typically set the pH of a tank between 8.0 and 8.3 while it produces between 7 and 10 dKH
  • Encourages stony coral and coralline algae growth | Product has a chelator in it that removes the metals from solution
  • Provides vital nutrients | Neutralizes traces of heavy metals found in tap water | It is not generally recommended to use Reef Crystals in freshwater situations

Description

No matter the size of your aquarium, Instant Ocean sea salts and water care products offer the smartest, easiest way to bring the ocean home. Our scientifically formulated sea salts are used exclusively by many of the leading large-scale aquariums and research facilities across the country. Instant Ocean Reef Crystals Reef Salt is formulated especially for use in reef aquariums. It contains essential ocean reef elements in concentrations greater than those found in natural sea water. Extra calcium encourages the growth of large and small polyp stony corals (LPS and SPS) as well as coralline algae. Extra trace elements provide an additional measure of vital nutrients, and extra vitamins help to promote vigorous growth and survival of corals, anemones and other invertebrates in a captive environment. Neutralizes traces of heavy metals often present in tap water. Mix Instant Ocean Reef Crystals Reef Salt with ordinary dechlorinated tap water – use ½ cup per gallon of water. Stir vigorously to ensure a good mix. Use immediately or aerate the water until it achieves oxygen/carbon dioxide equilibrium. See product label for complete use directions. Instant Ocean offers a full line of products, including sea salt, water treatments, test kits and accessories, to make sure your saltwater aquarium remains vibrant and healthy.

Brand: Instant Ocean


Liquid Volume: 200 gallons


Item Weight: 58 pounds


Item Form: Granules


Number of Packs: 1


Product Dimensions ‏ : ‎ 14.75 x 11.75 x 10.75 inches; 58 pounds


Item model number ‏ : ‎ AQ-RC1200-10


Department ‏ : ‎ Unisex-Adult


Batteries ‏ : ‎ Product Specific batteries required.


Date First Available ‏ : ‎ June 8, 2005


Manufacturer ‏ : ‎ Instant Ocean


Best Sellers Rank: #6,769 in Pet Supplies (See Top 100 in Pet Supplies) #42 in Aquarium Water Treatments


#42 in Aquarium Water Treatments:


Customer Reviews: 4.7 4.7 out of 5 stars (5,998)


Brand Name: Instant Ocean


Number of Packs: 1


Unit Count: 896 Ounce


Manufacturer: Instant Ocean


Number of Items: 1


Global Trade Identification Number: 22,


Item Highlight: Formulated For Reef Aquariums, Extra Calcium, Vitamins & Trace Elements, Promotes Growth Of Coral, Anemones & Invertebrate


Included Components: Reef Crystals Reef Salt (200 gal)


Item Type Name: Pet Supplies


Model Number: AQ-RC1200-10


Manufacturer Part Number: AQ-RC1200-10


Warranty Description: See Label.


Liquid Volume: 200 gallons


Item Weight: 58 pounds


Item Form: Granules


Pet Type: Dog


Target Species: Fish


Allergen Information: Cashews Free


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 20 – Oct 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Consistent!
Size: 200-Gallon Pattern Name: Aquarium Pond Water Treatment
I’ve used Instant Ocean Reef Crystals for a long time, and it continues to deliver great results. The mix dissolves quickly, produces clear water, and holds stable parameters — calcium, alkalinity, and magnesium are always right where they should be. I mix mine in a 32-gallon Brute can with a heater and small pump, and it’s usually ready to use in under an hour. No residue on the heater or pump and no cloudy water. Corals have good color and polyp extension, and I’ve had excellent growth over time. Pro tip: always pour the salt into the water (not the other way around) and use a powerhead for even mixing — it keeps it from clumping and helps the parameters stay consistent. I’ve tried a few other brands, but Reef Crystals gives the best balance of quality and cost. Perfect for routine water changes and dependable results. ... show more
Reviewed in the United States on October 6, 2025 by Seth
    • Easy to use, reliable product
Size: 160-Gallon Pattern Name: Aquarium Pond Water Treatment
Works as it should. I've been using this brand since I started my saltwater tank. My second bucket came kinda chipped up, but all the salt was intact and uncontaminated so no complaints. I will continue to order because this is a good deal.
Reviewed in the United States on April 1, 2026 by Bethany
    • Great product great price free delivery
Size: 160-Gallon Pattern Name: Aquarium Pond Water Treatment
The price is less than my local fish store.But most importantly free delivery. I've been using Instant Ocean Reef Crystals for my reef aquarium for years and have had nothing but success
Reviewed in the United States on April 23, 2026 by Amazon Customer
    • It's the industries most popular salt for a reason.
Size: 160-Gallon Pattern Name: Aquarium Pond Water Treatment
I have been keeping Reef Aquariums for over 30 years, from the days when reefers salivated at what Julian Sprung would write his next magazine article. Instant Ocean is IMHO not the industry standard, there are certainly better salt mixtures you can buy but at the end of the day it will make very little difference as Instant Ocean is certainly good enough to keep any coral I have come across alive and thriving. I don't know why one guy is saying go to BRS for the salt. BRS is selling this for $63 while Amazon has it for $44 with free shipping if you have Prime. The reason this salt is the most popular is that it gives the greatest bang for the buck and while its one of the cheapest salts its still a very good salt. I am not a fan of some of the latest pharmaceutical grade multi mixture salts that require like five different things to be added in exact proportions to make a perfect batch of salt. It's too complicated and just an accident waiting to happen. I am a Fan of Red Sea Salt but at almost double the price per gallon of water and not seeing any difference in coral growth I went back slowly to instant Ocean. My tip to you is that when you make a mix of lets say 50 gallons of water you make sure to let it mix via the pumps for at least 24 hours and aerate it properly. Do not add salt all the way to 1.026ppm as the salinity will increase as the mix goes through the 24 hour cycle. I usually stop at 1.020ppm and then check it again in 12 hours and add more salt if needed. When that's done test the water for ALK, Calk and of course the temperature. Heat or Cool the batch to the temp of your tank and then test the Alk, Calk and Mg. If any of them are down from your aquariums parameters then add the needed components in small amounts until you get it as close to your tank water as possible. Typically with Instant Ocean I rarely have to add anything but sometimes it will be a bit low on the calcium side. Nothing earth shattering but just enough that I would feel better correcting it. ... show more
Reviewed in the United States on September 5, 2019 by Robbyg
    • Awesome aquarium salt, mixes fast!
Size: 160-Gallon Pattern Name: Aquarium Pond Water Treatment
have been keeping Reef Aquariums for over 30 years, from the days when reefers salivated at what Julian Sprung would write his next magazine article. Instant Ocean is IMHO not the industry standard, there are certainly better salt mixtures you can buy but at the end of the day it will make very little difference as Instant Ocean is certainly good enough to keep any coral I have come across alive and thriving. I don't know why one guy is saying go to BRS for the salt. BRS is selling this for $63 while Amazon has it for $44 with free shipping if you have Prime. The reason this salt is the most popular is that it gives the greatest bang for the buck and while its one of the cheapest salts its still a very good salt. I am not a fan of some of the latest pharmaceutical grade multi mixture salts that require like five different things to be added in exact proportions to make a perfect batch of salt. It's too complicated and just an accident waiting to happen. I am a Fan of Red Sea Salt but at almost double the price per gallon of water and not seeing any difference in coral growth I went back slowly to instant Ocean. My tip to you is that when you make a mix of lets say 50 gallons of water you make sure to let it mix via the pumps for at least 24 hours and aerate it properly. Do not add salt all the way to 1.026ppm as the salinity will increase as the mix goes through the 24 hour cycle. I usually stop at 1.020ppm and then check it again in 12 hours and add more salt if needed. When that's done test the water for ALK, Calk and of course the temperature. Heat or Cool the batch to the temp of your tank and then test the Alk, Calk and Mg. If any of them are down from your aquariums parameters then add the needed components in small amounts until you get it as close to your tank water as possible. Typically with Instant Ocean I rarely have to add anything but sometimes ... show more
Reviewed in the United States on December 27, 2023 by tomer 66
    • We love bulk!
Size: 200-Gallon Pattern Name: Aquarium Pond Water Treatment
This is the perfect batch of you have a larger tank or just like to stock up. Personally I just like to stock up so I grabbed one of these and now I'm worry free for a while. No one likes to have anxiety with their aquarium and this takes some of that away.
Reviewed in the United States on June 2, 2026 by Ryan E. Rogers
    • Excellent product. Worth the price!
Size: 160-Gallon Pattern Name: Aquarium Pond Water Treatment
Review Image by Jason Michaels
This is the best aquarium salt mix on the market (for the price!). It isn't cheap, but this mix does its job a lot better than Marine Crystals. I can't speak for some of the premium brands that cost double what this does, but I can't imagine that they would be worthwhile investments. My reef tank appreciates the quality of the water, and I've had no issues getting the salt to dissolve by hand in just a few seconds. ... show more
Reviewed in the United States on May 27, 2025 by Jason Michaels
    • Get the bucket not the box
Size: 160-Gallon Pattern Name: Aquarium Pond Water Treatment
Good quality salt bucket, I always use the bucket over the box, I had several bad salt boxes over the years but never a bad salt bucket.
Reviewed in the United States on May 1, 2026 by Lance Boudreaux

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