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

By Nature's Ocean
Rated 4.1562 out of 5 stars
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$60.55Chewy Price
$75.99Chewy Price

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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.
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 this rock cured? Does it need to be cured? I've read that dry rock needs to be cured because it can be loaded with Nitrates and Phosphates
Answer by ChewyOct 31, 2018
This rock is cured, however we recommend rinsing the rock of any potential debris prior to adding the rock to your aquarium.

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.

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.

ReviewsWrite a Review

Rated 4.1562 out of 5 stars
64 Reviews
Would recommend to a friend

64 Customer Reviews

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.

Rated 2 out of 5 stars
By Frank on Aug 15, 2021

Quality and size

Quality is good but the size is terrible I was expecting a few medium rocks but I got 3 huge rocks, it did not help me with my scape

Rated 4 out of 5 stars
By linkedsilas on Apr 23, 2021

Impressed with purchase

I have been reefing over 5 years and this was my 4th tank I am setting up. Decided to start from scratch and took a chance on this purchase. Was worried I would get broken /not nice pieces, but received 3 large whole intact pieces. Its not as "holey" as pukani, then again, youre not buying pukani rock. I was not disappointed. I would say it looked similar to the picture. I havent weighed it yet to see if I got actual 40lbs. It will need a real good rinse since it is dusty, but there wasnt much broken pieces or dust left over in the bag.

Rated 5 out of 5 stars
By five on Aug 23, 2021

Nice reef rock

Was about to get the rock at a great price free shipping and it came with 3 business days

Rated 1 out of 5 stars
By donny on Apr 17, 2021

coral base rock

I expected to get rocks as pictured instead i get two big rocks[20 pounds a piece].What the H--- - L am i suppose to do with two big boulders.This is the only problem i ever had with CHEWY,still would recommend Chewy..

Rated 5 out of 5 stars
By Haro on Nov 29, 2020

not as much as expected (40 lbs)

I ordered a 40 lb package and u got three large rocks all in one box. And when I saw large, I mean large. These were a tad smaller than basketballs. Nothing wrong with it. I just think rocks should be a little less expensive. This is a steal at a little less than 2 dollars a pound, totally worth jumping on this, and here’s a guide on how much to buy: (trust me, I want to be a stingy as you) 40 gallon: 40 lbs, 90 gallon: 90 lbs, and so on and so forth. Hope this helped you. TOTALLY BUY, ROCKS ARE SO EXPENSIVE BUT THESE ARE VERY CHEAP, WILL NOT REGRET.

Rated 5 out of 5 stars
By Kent on Jan 26, 2021

Great Life Rock

Received the rock quickly. Got 3 larger pieces and one small. Very little rubble or breakage in package. Definitely rinse the rock before putting it in the tank.