Mon-Thurs 7am-5pm PST
Fri 7am-4pm PST

Questions about products, orders, shipping?
Contact us by call or email

CaribSea Dry Aragonite Special Grade Reef Sand 15 lb


Item #: CS0020

Select a Size:

In Stock

1.0–2.0 mm diameter grain size. A revolution in reef-keeping! This is the one you’ve been reading about in all the hobbyist publications. This grade of aragonite is specifically engineered for plenum-type nitrate reducing beds or anywhere a deeper bed is called for. The pore water space created by precision grading also allows maximum pH support and dissolution of calcium carbonate.

CaribSea Aragonite buffers to the highest pH and delivers more calcium, carbonate, and trace elements than any other substrate. Little or no rinsing required, aragonite keeps aquariums healthier, longer.

Sand Bed Calculator

Use our CaribSea-powered calculator to find out exactly how much sand you need.

Manufacturer information

At CaribSea we take aquariums seriously. Since 1972 we have supplied hundreds of public aquariums, zoos, aquaculture facilities, public and private institutions, and hundreds of thousands of dedicated aquarists with the highest quality marine and freshwater products. CaribSea has been in the forefront of the principle that substrates are a piece of equirment, not just a decorative afterthought. Caribsea substrates are as precisely engineered as any piece of advanced equipment used by today`s hobbyists and professionals. CaribSea products are the chemical support, biological filtration, and biodiversity backbone for many of the most spectacular aquatic displays ever created. We are now celebrating our 35th year in the business, and our product line has continued to grow; making CaribSea your aragonite source and so much more.

5 Stars


Reviewed on
March 26, 2021

Yes, I would recommend this.

Good quality sand

Pros: Good for African cichlids, looks good

Cons: Easily clouds water

The bag says "for cichlids" but it should say "African cichlids." They like the hardness brought on by the aragonite. Make sure to clean this sand properly to cut down on cloudiness.

Was this review helpful? 0 0


Reviewed on
February 20, 2021

Yes, I would recommend this.

Great sand!

Pros: Nice mix of small and large grains

Cons: None

A great mix of smaller and large grains. Even with fairly fast flow through the tank it stays put and looks great!

Was this review helpful? 0 0


Reviewed on
July 28, 2020

Yes, I would recommend this.

Only sand I will buy

Pros: Great product. Clear water. 10/10

Cons: Price.

This is the best sand a beginner could get, I say that as a beginner, I ended up buying to 40lbs bags as I thought i need 80lbs in my 55 gallon tank, one bag was perfect. Note that I have a 55g tall.

Was this review helpful? 0 0


Reviewed on
April 18, 2020

Yes, I would recommend this.

Best sand for reef

Many attest to this being the perfect sand for a tank. I have to agree. Just make sure to clean it well to keep cloudy water to a minimum.

Was this review helpful? 0 0


Reviewed on
March 14, 2020

Yes, I would recommend this.

Great sand

Pros: Great size

Cons: Nothing lol

I use this sand in all my tanks. I want high flow without sand blowing around. This is the perfect size, not too big not too small.

Was this review helpful? 1 0


Reviewed on
December 18, 2019

Yes, I would recommend this.

Great Substrate

Pros: Good color. Nice sized

Cons: A little more filtering maybe needed to get it crystal clear

Used with FOWLR. Perfect. Sand stays put. Fish can sift it, etc

Was this review helpful? 2 0


Reviewed on
April 05, 2019

Yes, I would recommend this.

Great Product!

Pros: Self levels in aquarium well, Great size of substrate, Does not blow around with water flow,

Cons: Needs a LOT of rinsing, but once rinsed works great.

In my previous aquariums I have used a wide variety of substrate. I purchased 80lbs for my new 75 gallon aquarium.

The dry aragonite special grade is a great size and color. It does not blow around like lots of sands or smaller sizes and very easy to work with.

I do recommend THOROUGHLY rinsing the substrate before adding to your aquarium.

Was this review helpful? 4 0


Reviewed on
March 27, 2019

Yes, I would recommend this.

nice color and nice granular size for reef

I would not go smaller in granule size for a reef. This has great color as well.

Was this review helpful? 0 0


Reviewed on
March 25, 2019

Yes, I would recommend this.


Pros: Color, size

Cons: Few pounds

Perfect size and color

Was this review helpful? 0 0


Reviewed on
October 09, 2018

Yes, I would recommend this.

Clean and easy

Pros: Wont blow around, looks great

Cons: none

Large enough that my gyre doesnt blow it around. My wrasse seems fine burying in it. Came pretty clean. Dint fog my tank at all after washing it.

Was this review helpful? 2 0