CerMedia MarinePure 1.5-Inch Sphere Bio-Filter Media for Marine and Freshwater Aquariums, 2-Quart

Great stuff. Run in all of my aquariums.

Good stuff

These came in such a small looking box I initially was disappointed and thought I would have to buy more. NOPE glad to be wrong, their were actually too many to fit in my canister tray so I had extras to put in another filter. Great deal. Thanks

Been in 125 gallon reef tank about 6 months works as described

These are the only bio filter media youll ever need. I feel like I can add any bio load I want to my 60g tank and not have to worry.

Very happy with the nitrifying bacteria this media sustains. I did a new setup of a Juwel Rio 300 (350 litres) freshwater with 8 bags of 9 litres ADA Amazonia, and with Ammonia of 2-4ppm leaching from the substrate, it only took 12 days for the clean canister filters filled with MarinePure to start cycling my tank.

I bought this based on a video touting the benefits of this product - said its like added more live rock to your tank. A few months later my nitrates started going through the roof! Ive removed them and now the numbers are slowly returning to normal.

Just put these in my sump instead of bulky live rock. Not sure yet how well they will work but they are very porous and light weight.

Just put the spheres in a Marineland 360 canister filter that is servicing a 55 gallon anemone tank Displaced 50% of the ceramic rings in order to prevent a mini cycle. Left bio balls in place. Also left the carbon in place. 1 box is more than enough for a filter thay size. Leftovers were dumped into the sump on another tank for conditioning. Will put those in the marineland 360 displacing the reminder of the ceramic rings. Heard great things about the product, but the jury wont be in for about 4 to 6 weeks on its effectiveness. If it works, next up is the 150 gallon mixed reef with large puffers. Will use the block in the wet dry sump and another box of the spheres in a marineland 530. 1 box should be enough in the canister filter.

They dont sell a big enough pack, i would have to buy 20 packs to get the amount i need. But the product works good.