Yes, Im sure it does. However it does settle on top of the sand where its easily disposed of. Have you even owned one? I dont think so.. If you dont OWN one....I dont think you should make comments that you have no idea about. Dont believe me? check the usenet. Got TONS of people that like them..
Im not wrong on This. a FBF on your tank will only improve it. Plus, you can use it to help a new tank go through a cycle...check articles on the web if you want... sorry that your wrong. I did the research on them before I spent the $$$ on it and found that they are EXTREMELY useful
Yes..you dont need a fbf to go through a cycle. Without it on a new tank..it can take a month or more. With a fbf that was used on a previous tank, it can take a week or so..since the bacteria are already settled in the filter..