Ceramic Filter Media Brick 4 Pack 3.6lb NanoSpheres Biological Filtration

This is the best bang for your buck. Great bio blocks that fit in small places but provide a ton surface area. Use these in my frag tank to boost bio filtration.

I have these in my 180 gallon saltwater aquarium in the sumps refugium and it's crawling with pods and life. Only 2 pieces of live rock and these and the refugium is thriving.

So far these bricks are doing well. I know from experience that these type bricks are prone to deterioration over time. I can only hope that they are long lived. They seem to me to be a quality product. I didn’t get a lot of dust off them when I removed them from their container so, I believe that to be a good sign for longevity. I’m 3 starring these for now and will edit if I see some breakdown of the media in the future.

These are exactly what I was looking for. I like the small size of these. I have some smaller tanks so these fit perfectly in my hob filters.

Buy this. It works. And dang dies it work good boy.

To early to tell how well its going to work but I’m sure it will do what it supposed to do..

Excelent quality

I've been keeping saltwater reef tanks for 30 years. Bought these for a 30 gallon quarantine/hospital tank because they are easy to remove clean and sterilize when the tank is not in use. They really work great! Zero ammonia issues. Very, very happy with these.

De buen tamaño, porosidad, y calidad, hasta ahora todo bien en mi sump.