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Buy CaribSea Dry Aragonite Special Grade Reef Sand 40 lb and Get API Quick Start 8 oz FREE

Item #: CS00501

We no longer carry this item

CaribSea Dry Aragonite Special Grade Reef Sand 40 lb
1.25–1.95 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.

API Quick Start 8 oz
In a new aquarium, harmful ammonia and nitrite build up from fish waste, often resulting in fish loss. The unique, patented nitrifying bacteria in API Quick Start are scientifically proven to quickly consume ammonia and nitrite to help prevent "new tank syndrome."

Aquarium Pharmaceuticals states that Quick Start "allows immediate addition of fish to a new freshwater or saltwater aquarium." Use when starting a new aquarium, adding new fish, changing water, changing filter media, after medicating , or whenever ammonia or nitrite are detected.
  • Allows instant addition of fish
  • Limits toxic ammonia and nitrite
  • Helps prevent fish loss
  • Immediately starts aquarium cycle
  • Contains live, nitrifying bacteria
  • No refrigeration required
  • All natural

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.


Reviewed on
February 07, 2021

Yes, I would recommend this.

Works well

Pros: Doesn’t blow looks good

Cons: A little smaller grain looks better to me

I wanted a fine grain sand but they blow around too much. I went with this in my new tank. It doesn’t blow around but it’s a little bigger grain than my older tank. I don’t remember what I used in that tank though. I am satisfied though.

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Reviewed on
April 29, 2020

Yes, I would recommend this.

Best customer service experience ever!

Pros: Amazing substrate for reef tank

Cons: None

Bought this for my sons new 75 gallon reef tank, I got him for bday, amazing substrate for reef aquarium. Shipping company must have dropped/crushed cause I recieved bag half full with zip tie holding together. Emailed marine depot they immediately sent new bag even though it wasn't their fault. Never had a place take care of something so fast! Now I will only shop this site!

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Reviewed on
April 25, 2019

Yes, I would recommend this.

The Color

Pros: none

Cons: I love the color

The sand does not blow around

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Reviewed on
May 02, 2017

Yes, I would recommend this.

CaribSea Dry Aragonite Special Grade

Pros: Looks great but heavy enough it won't blow around.

Cons: None

Great sand for high flow reef tanks.

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michael batkiewicz

Reviewed on
January 05, 2014

Yes, I would recommend this.


a very good coverage rate great product very uniform

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