I am debating.....should I put the undergravel filter in that was given to me? Or should I just by a bio wheel filter? Any suggestions? This is for my 75 gallon tank for freshwater fish. I want the simplest but most effective....don't we all? I'm debating on whether to use the UGF because i have read so much about cleaing and maintaining. What would y'all do???? I already have an aqua tech filter but it is really only for a 60 gallon....can I run that until I get the new filter, if I decide not to use the UGF? There will be no fish in here for some time yet.