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

By Nature's Ocean
Rated 4.0274 out of 5 stars
$56.28 (-26%)Chewy Price
$75.99Chewy Price
In Stock
FREE 1-3 day delivery

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.

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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 4.0274 out of 5 stars
73 Ratings
Would recommend to a friend

73 Customer Reviews

Rated 5 out of 5 stars
By David on Nov 6, 2023

Amazing dry rock.

I was looking rock to aquascape with and this is the best deal I could find. Yes the order does come with 2-3 rather large pieces and 1-2 smaller size pieces to fill the 40lb mark. Picked up a $5 chisel and $20 of glue/activator and got to work. If you don’t want to put in the effort to build your own aquascape all you need is a $5 chisel and a household hammer. The rocks have natural openings/weak spots and it’s easy to break them into reasonable size pieces with a little effort. The smaller bits are perfect for the refugium. Note in the picture I did have one base piece to start but I also had a leftover 1-2lb rock and multiple fragments for future projects.

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