I have a whisper 20 on the back of my 20 gal tall. I have another whisper that's twice this size and I want to know if that would be overkill for my tank. (Well, I know it's overkill, but do you think it would be too much?) Noob question, I know but I seem to be having a difficult time finding information on water flow and got tired of searching for it.
Hope that's enough info...