I've got four unused filter blocks. I believe they are a ceramic type material. I can't recall the manufacturer's name, but these blocks are extremely porous and designed to provide large amounts of surface area for aerobic and anaerobic bacteria in your reef.
I'm currently using them in my reef under the shallow sand bed to provide a stable base and simulate a deeper sand bed without actually having a deep sand bed. You could also plop them in your sump or refugium to provide additional surface area for bacteria to colonize.
These are about 4-inches thick, which would be thick enough to support both aerobic and anaerobic colonies. Thinner filtration blocks don't have enough area for the anaerobic bacteria to colonize on the inside. Anaerobic bacteria reduce nitrates in your system.
They are 12x12-inches. My guess is they weight 2-3 pounds each so they are pretty light.
I noticed that one is broken in half which would be an easy repair. I also noticed that the others are developing a similar crack. This would not impact performance.
I'm asking $10 each, or if you want all four $30. I can ship at buyers expense or deliver them to the Michigan Coral Expo on January 27.
I've got four unused filter blocks. I believe they are a ceramic type material. I can't recall the manufacturer's name, but these blocks are extremely porous and designed to provide large amounts of surface area for aerobic and anaerobic bacteria in your reef.
I'm currently using them in my reef under the shallow sand bed to provide a stable base and simulate a deeper sand bed without actually having a deep sand bed. You could also plop them in your sump or refugium to provide additional surface area for bacteria to colonize.
These are about 4-inches thick, which would be thick enough to support both aerobic and anaerobic colonies. Thinner filtration blocks don't have enough area for the anaerobic bacteria to colonize on the inside. Anaerobic bacteria reduce nitrates in your system.
They are 12x12-inches. My guess is they weight 2-3 pounds each so they are pretty light.
I noticed that one is broken in half which would be an easy repair. I also noticed that the others are developing a similar crack. This would not impact performance.
I'm asking $10 each, or if you want all four $30. I can ship at buyers expense or deliver them to the Michigan Coral Expo on January 27.