fluidized bed filters

[jeremyj0247]

are these any good? I am looking for a good biological filter. It is hard for me to get any good live rock. I would have to order it of the net, and if I did that I would get charged an arm and a leg for shipping. My tank has only been up for two weeks. I have bio-wheels on it now, but after further review i have found out that they suck. If I did get live rock, how much would I need for a 38 gal. It is a fish only tank. also I have a rena canister filter. If i put some ceramic rings or something along that line in the filter would that help out. thanks for your suggestions.

 

[roader247]

I have used a Bio-Wheel they are Ok you need to keep them clean and the pad are little pricey. I have one running right now on a quarantine tank and a fresh water tank. They will most likely make your nitrates high. Not good for corals but most fish can handle it.