I have a 20G heavily planted tank. Currently I am using a Whisper 40 power filter and it is not working properly. I went out and bought a penguin bio wheel filter today and it was so loud you would have thought there was a brook running through the house, drove me mad. I looked at the aqua clear filters but there is no filter pad thing. What happens to all the dirt and stuff that gets into the filter? Doesn't it just clog the sponge? In a chat last night Semper recommended the HOT magnum canister filter but as I read the info it said for everyday mechanical / chemical filtration. Semper - is there biological component that I missed? I'd like to know which filter you all like.