I got 4 supertrapp cartridge filters for my 2 penguins on my 90 and one whisper 30 that is on my 29. My tanks are even clearer than ever. They say that the cartridge lasts forever and you just replace the "trapp" that catches the waste. Also what are the differences in the different mechanical color blocks for the Fluvals??? I just replaced them with the white blocks...they say to do it every 3-4 months I think but I did it after 2...I rinsed them once. Any expeirences with these products and suggestions would be appreciated.
