I have a spare 20 long tank. The only filters I have to spare are a c-360 and Aqueon 55/75. Both are rated for 75 gallon tanks. Is there anyway to make a C-360 work on a 20 long or will it be a whirl pool? fish going in the tank is L200 and Honduran Redpoint. I know the pleco would be happy with the current I don't want my HRP being blown around.