Nature's Ocean Natural Coral Aquarium Base Rock, 40-lb box

By Nature's Ocean
Rated 4.0139 out of 5 stars
$75.99Chewy Price

In Stock
FREE 1-3 day delivery

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Total Price: $143.24

About This Item


  • 100% natural aragonite rock is great for decorating aquariums, conserving natural reefs, coral farming, culturing rocks and growing live coral.
  • Rapidly adapts to live environments and will not affect the cycling of your tank water so it’s easy to set up.
  • Acts as a naturally porous biological filter and is free of biofilm so it’s perfect for aquascaping.
  • Naturally porous surface helps grow denitrifying marine bacteria that help decrease nitrate levels.
  • Works for saltwater and freshwater aquariums and has been pre-soaked to prevent leeching so you don’t need to soak it before using.

See More


Play Video: Learn More About Nature's Ocean From Our Team of Experts
Learn More About Nature's Ocean From Our Team of Experts

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Questions & Answers

13 Customer Questions

How many rocks?
Answer by ChewyMar 23, 2018
2 rocks ranging from 12-17 inches in length are included.

Is it possible to request smaller rocks to make decorating multiple small tanks easier? A 12in rock won't fit well in a 5-10 gallon tank.
Answer by ChewyAug 20, 2019
While there is no option to request smaller pieces at this time, other pet parents have reported being able to easily break the coral into smaller pieces using a hammer and screw driver or chisel.

Can I add this rock to an already established Marine setup with fish and corals?
Answer by ChewyJul 29, 2018
The unique shape of these rocks make it easy to stack when growing live corals or adding to coral-based environments.

How long can the rock be out of the water?
Answer by ChewyFeb 21, 2018
The Coral rock comes as dead base rock but once applied to saltwater it can take up to 3 weeks for it to become live.

ReviewsWrite a Review

Rated 4.0139 out of 5 stars
72 Ratings
Would recommend to a friend

72 Customer Reviews

Rated 2 out of 5 stars
By devyn on Sep 18, 2023

Not as described

The reviews and pictures show a group of smaller-medium sized rocks adding up to 40lbs. I recieved my order today its 3 massive ugly rocks. Don't waste your money or time buying this product.

Rated 4 out of 5 stars
By Brandon on Apr 3, 2023

Good value!

This rock was a really good value. I wanted to create my own aquascape and needed rock I could break into unique shapes. Customers should understand that this comes in 2-3 huge chunks of rock. You will need to break this rock up some if you don't want huge boulders in your tank. However, this rock was REALLY hard to break. I was able to use a hammer and chisel to get some chunks off but understand, it takes alot of work. Overall, great value for the money.

Rated 1 out of 5 stars
By Edward on Apr 18, 2023

One Rock in the Box

I sent one rock and it weighed 4.5 lbs. The picture showed multiple rocks and said forty pounds. I got one rock! The rock is really nice, wish there were 40lbs.

Rated 5 out of 5 stars
By NewReefer on Mar 29, 2023

perfect addition

Arrived as described. 2 large rocks. Perfect for large tank.

Rated 2 out of 5 stars
By Chelsea on Jan 23, 2023

Be aware when buying

For a 40lb box, we expected several rocks, however, there were only 3 massive rocks that do not fit our tank.

Rated 5 out of 5 stars
By Perfect on Sep 16, 2022

Perfect size Rocks

My rocks pieces are massive and I could of break into smaller ones but kept how it is. Overall looks amazing in my 75g tank

Rated 5 out of 5 stars
By corey on Mar 16, 2022


This is my second time purchasing this stuff. I’m in college and hate to spend more money than I have to. I found this to be the cheapest thing on the entire internet. People complain about the size but what do you honestly expect for rock this cheap? I just bought a $5 chisel and actually glued some of the rocks together to create cool shapes. I’ve been waiting a long time to make this review so I would have a pic of the finished product. This stuff is awesome. Sponsor me natures ocean

Rated 2 out of 5 stars
By Orhan on Feb 7, 2022

just buy the caribsea rock

I got these because they were significantly lower in price compared to the other ones. They are cheaper but unless you want large boulders in your tank it’s not worth it. First of all, they are very dense, not as porus as pictured. Breaking them into smaller peaces and putting it together to make semi-decent rock-scape took several hours and it was quite messy; not to mention you will also need a bonding agent (epoxy or aquarium cement), super glue, a big hammer, eye protection, etc… All things considered, ready made rock is probably a better buy…

Rated 5 out of 5 stars
By Brayden33 on Feb 9, 2022

Great Dry Rock

I had received 3 huge chunks of rock which I had to break with a hammer and make a bunch of smaller ones so they would fit in my current aquascape. My only complaint would be that shipping took a couple extra days but that's to be expected with today's times.

Rated 1 out of 5 stars
By Devan on Nov 27, 2021

Bad Rock Sizes

First of all it looks totally different in person. There are zero holes on it, it’s just smooth rock covered in layers of this dust. And 2. There was just two massive pieces in my box. And a small one about a inch in length. I thought this rock would come in like the pictures and be different in sizes and there would be a variety of rocks, but there wasn’t. Bought this to add to my 90 gallon tank but if there are not two rocks this isn’t going to add to the rock that I already have. Would not recommend to anybody.