EcoBio-Block EcoBio-Stone with Beneficial Aquarium Bacteria

By EcoBio-Block
Rated 3.4444 out of 5 stars


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$15.49Chewy Price
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Frequently Bought Together

This Item – EcoBio-Block EcoBio-Stone Nano Natural Water Clarifier & Odor Remover, 2 count
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Fluval Biomax Bio Rings Filter Media, 17.6-oz
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Aqueon Small Replacement Filter Cartridge, 3 count
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Total Price: $33.76

About This Item


  • Helps reduce aquarium maintenance by keeping aquarium water crystal clear and odor free.
  • Unique, mineral-rich porous stones contain natural bacteria spores that help break waste down into safer nitrates and accelerate the nitrogen cycle.
  • Volcanic rock also leeches calcium and trace minerals into the water to create a healthy environment for fish.
  • Works equally well in both fresh and salt water environments; also recommended for reptile and amphibian habitats.
  • Small stone treats 8 to 16 gallons and medium stone treats 15 to 40 gallons; can use multiples as needed to accommodate your tank size.

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Fish TypeBetta, Bottom Feeder, Cichlid...Marine Fish, Marine InvertebrateBetta, Bottom Feeder, Cichlid, Goldfish, Tropical FreshwaterMarine Fish, Marine InvertebrateMarine Fish, Marine Invertebrate, N/A
Aquarium TypeSaltwater, FreshwaterSaltwaterFreshwaterSaltwaterSaltwater

Questions & Answers

20 Customer Questions

How would I know if and when the EcoBio-Stone needs to be replaced?
Answer by ChewyJun 07, 2018
The EcoBio-Stone should be changed once the water starts becoming cloudy. The block can last from 2 days up to 3 months in the tank.

Do you still need a filter with this or does it replace a filter?
Answer by ChewyApr 22, 2018
This rock will benefit your tank in numerous ways however you still need a filtered pump. This helps with other chemicals to be removed from your tank and keep your fish safe.

Can you use this for aquatic turtles
Answer by ChewyApr 23, 2018
This product can be used with aquatic turtles.

Does this go in the aquarium or does it have to be placed in a filter?
Answer by ChewyApr 12, 2018
It is not necessary to place this Block in a filter. To use, rinse off the stone with chlorine-free water, soak overnight and add to your tank, preferably near an air source. If you have an airstone, place it near the airstone. Once immersed in water, beneficial bacteria in the stone will start to propagate and disperse into the water approximately every 30 minutes.

ReviewsWrite a Review

Rated 3.4444 out of 5 stars
27 Ratings
Would recommend to a friend

27 Customer Reviews

Rated 4 out of 5 stars
By Turtlestuff on Mar 30, 2023

Easy and not ugly

They seem to do what the claim, and they look good in a tank. I have one in with my turtle and he lays on it.

Rated 1 out of 5 stars
By AshleyM23 on Jan 8, 2023

Doesn't seem to help

Before I put it in my tank it was a little bit cloudy but my tank did not have a smell. I added it as a preventative, but after having it in for a few weeks my tank smells gross and has not helped the cloudiness. It has also started develop little black spots all over it.

Rated 5 out of 5 stars
By Audine on Apr 7, 2022

Crystal clear choice

I have one for a 10 gallon aquarium. I do weekly water changes so having a source of good bacteria like this block is essential. The water stays clear too. My tank seems better after adding this product and zeolite to my filter too. I have 8 fish in my 10 gallon.

Rated 5 out of 5 stars
By Larisa on Feb 22, 2022

Amazing!! Got rid of ammonia.

I’ve had an ammonia problem for 2 months in my tank. No matter what I did it never got below .25 ppm. I tried water changes and several types of ammonia neutralizers. I’ve added so many different brands of bacteria. It helped but never got it to 0. My ammonia was 0 less than 24 hours since adding this block. I measured before I added this block and I didn’t add anything else. I also added driftwood to my tank a few days ago that was clouding up the water and this helped clear the water up a lot in not even 24 hours. I know it can take weeks for full effects and I can’t wait for it to be at its full potential. The only downside is that it is kind of big and ugly, but I’m gonna hide it behind some driftwood so it won’t be an issue.

Rated 5 out of 5 stars
By Jacob on Jun 11, 2021

They really work

I was having issues with cloudy water and constant algae blooms in my 55 gallon tank. I bought two of these based on reviews, but wasn't really expecting much. Even though I was desperate to give them a try and wanted to just put them in the tank right away, I followed the instructions and soaked them overnight first. I'm not a very patient person, so after a couple of days without seeing much improvement, I was ready to write them off. However, the instructions do say it can take a couple of weeks, so I waited. The results have been amazing! I have attached before and after pictures.

Rated 1 out of 5 stars
By Indigo on Jun 9, 2021
Top 250 Contributor

Didn't work for me

I've kept freshwater and marine fish for over 40 years and currently maintain six large tanks. I have one tank that recently started having issues with cloudy water. Water parameters were within normal limits, no new fish or plants, excellent filtration, not overcrowded and I do regular water changes. I was and remain mystified as to why this aquarium has suddenly developed this issue. So I decided to try this EcoBio-Block. It hasn't helped at all. If anything the water is more cloudy. Fortunately this EcoBio-Block hasn't caused any ill effects with my fish or inverts, and I am glad it worked for some, but I cannot in good faith recommend this. I think it's a gimmick--an expensive gimmick. It also looks like a block of raw hamburger. Not the look I was going for in my show tank so out it comes and into the trash.

Rated 5 out of 5 stars
By FishFinatic on May 7, 2021

It's a game changer

First off clean your tanks routinely. This isn't a magic fix. Though it replaced a few chemicals I'd used to balance things out in my tank's. No more playing with a variety of chemicals to keep things balanced. Within a few days there was a significant difference. Just a FYI I have multiple freshwater tanks with gold fish, blood red parrots, dojo loches, kuli loach, mollies, tetras, betas, plecos, cat fish, rams, dwarf frogs, guppies, birchir, variety of snails, and fresh water goby. This product was so impressive to keep things balanced in my 50 gallon I bought one for all my tanks from the couple of 10 gallons an all the big ones.

Rated 5 out of 5 stars
By mellB on Jan 22, 2021

So happy with this purchase!

I’ve been fighting cloudy water for a year and nothing has helped. We change the filters OFTEN, I upgraded the filter pump, and we’ve used a clarifier as often as recommended. Nothing worked. I wasn’t sure this would work either after the water stayed cloudy for weeks. It took almost a month but it’s crystal clear!!! I 100% recommend this product.

Rated 1 out of 5 stars
By Buckeyesgirl on May 20, 2021

Does not work

This rock made my tank very cloudy. Had to take it out. Waste of money

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

They really work!

I bring my large koi & goldfish indoors for the winter and even with water changes, filters, live plants, etc. the water & fish are healthier with these stones.