I have a 40 gallon freshwater with a large bull head catfish a large pleco and 2 other large fish. My problem is catfish are very dirty I clean the tank and one day later the filters are so clogged water barely flows threw two days later and there is lots of poo all over the bottom. I so sick of the tank being nasty all the time I want to get rid of the catfish but my wife wont let me. Is there anything I can do to solve this?