I have a 55 gal with a topfin60 and a fluval u4 recently my top fin has been making a loud vibrating noise so I removed all the pieces cleaned the impeller well and put it all back the way it was and its still making the same loud noise I bought the filter at petsmart but don't have the recepit anymore, what should I do? If the topfin goes down will my fluval u4 be enough to handle my tank? I have a red tailed barracuda a tiger dat a bichir and a green cory