CARIBSEA Super Naturals Crystal River Aquarium Substrate, 40-lb bag -

CaribSea Super Naturals Crystal River Aquarium Substrate

By CaribSea
Rated 4.4286 out of 5 stars
Color: 40-lb bag

$43.99Chewy Price

In Stock
FREE 1-3 day shipping over $49

About This Item


  • Natural-looking crystal river gravel helps your finned friend feel right at home.
  • Pre-washed, pH neutral and promotes the growth of beneficial bacteria colonies.
  • Creating a natural environment for your fish helps reduce aggravation caused by reflections in the bottom of your tank.
  • Great for use in marine and brackish aquariums (sold separately) with proper buffering.
  • Each grain measures approximately 0.25–1.0 millimeters in size.

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Questions & Answers

11 Customer Questions

Is this safe for beta fish?

Is this safe for guppies?
Answer by ChewyMar 10, 2022
This substrate is safe for guppies since they are tropical fish.

Is this live sand & is it good for a African Dwarf Frogs?
Answer by ChewyMar 13, 2023
This Crystal River substrate would be a good choice for African clawed frogs. It’s pre-washed, pH neutral and promotes the growth of beneficial bacteria colonies.

Is this sand soft ???
Answer by ChewyMay 16, 2022
This substrate is soft-belly safe and features smooth grains.

ReviewsWrite a Review

Rated 4.4286 out of 5 stars
7 Reviews
Would recommend to a friend

7 Customer Reviews

Rated 5 out of 5 stars
By DrCF on May 19, 2022

As advertised

Description is accurate regarding grain size of 0.25-1mm, and this sand is pretty uniform in grain size (very very little sand outside that size range). Rinsing 3 times was sufficient to remove any sand dust. Website still will not allow photo upload, despite being well under the limit of 5mb.

Rated 1 out of 5 stars
By taz1 on May 4, 2022

Glorified play sand

To no fault of Chewy. Great price, fast shipping. Caribsea showed it as coarse sand to micro pebbles. This is fine sand. I have very expensive filters. This would wreck impellers and motors. And nearly impossible to vac. Now I will have top notch horseshoe boxes this summer.

Rated 5 out of 5 stars
By Oldfloster on Jun 3, 2022


Didn't think I'd like it, but it's the best I ever had! It's safe and will not harm fish, keeps water clean, and beautiful to look at. I'm totally impressed!

Rated 5 out of 5 stars
By GigiS on Feb 7, 2022

Great unfortunately one bag came with tear at side have to reorder a replacemet

Wonderful got two bags of this and two bags of another sand for contrast, unfortunately one bag was packaged for shipping and it clearly had a tear in side instead of replacement before shipping they shipped it and sand about 1/2 cup was in the box when delivered.

Rated 5 out of 5 stars
By Sarah on Dec 8, 2021

Pre-washed and Beautiful

This sand says it comes pre-washed and it really does. I added about 40lbs of sand and my water was barely even cloudy. That small cloudiness settled and cleared up within a few hours

Rated 5 out of 5 stars
By Lilah778 on Dec 3, 2021

Very Beautiful sand

The sand turned out to be really nice and beautiful I enjoy having it in my 3 gallon tank that I just set up

Rated 5 out of 5 stars
By DogMom21 on Jul 16, 2021

Better than I expected

Was afraid it wouldn't be white or the grains would be too big but it's perfect