Natural sand, gravel & bio-substrate · graded in millimetres · The tank floor, done naturally.

Phosphate free

Aqua Natural Coarse Aragonite Sand

4.4 · 436 reviews

$14.69

Size / option: 10 lb bag

Sold and shipped by the online store behind the button; bags go back the same way

The coarse grade of the same Bahamian aragonite: phosphate free, ocean-harvested rather than land-mined, and heavy enough for strong reef flow.

Product highlights

Coarse grain for strong flow
Phosphate free
Ocean-harvested
Buffers pH at 8.2
10 lb, 20 lb or a 4-pack

Bag sizes and prices

Option	Price
10 lb bag	$14.69
20 lb bag	$34.52
10 lb bag, 4-pack	$57.35

Specifications

Composition	98% calcium carbonate
pH	Holds 8.2
Phosphate	Free
Use	Reef tanks, sumps, refugiums

Good to know

Coarse aragonite suits tanks with powerheads aimed low; fine oolitic sand would drift into dunes.

Orders and returns

The order, shipping and any return are handled by the store that sells it. See how orders travel.

Reviews by real customers

Aquarium supplement

Bought this for my pond to increase calcium. Good stuff.

Anon · September 2026

Excellent purchase

Great purchase ! Clean and easy to add to a saltwater tank

ChanChenh · May 2026

Beautiful sand that helps the reefs!

I have three saltwater aquarium "reef" tanks and have used Fiji Pink and another popular brand for two of them. I chose this sand for the third and it is absolutely gorgeous - I got the "coarse" kind which doesn't blow around as much in a tank with moderate flow (I have LPS and SPS corals). Perfect size, very clean, just as nice as the Fiji and ethically sourced to help support coral reefs, am very happy with this purchase!

L. · January 2021

Bought to raise ph in aquarium

I bought this to raise ph in my aquarium. Works well so far and has been a gradual increase over the last 2 weeks. Has now seemed to peak at 7.2. I rinsed with water to get off dust and other floaters. Then sprinkled a small amount around my 20 gal aquarium (1/2 cup). It has slowly disolved and raised my ph exactly how I wanted. Also fyi 10lbs is A LOT. This will last me for a looooong time.

Robyn · June 2022