For a 55 gal
, I would recommend a canister filter as they are better equipped (IMO
) for dealing with the quantity of water you are looking at. I myself have never had a tank that size and never actually owned a canister filter, so I'll leave recommendations about specific models to those who have experience.
The other option would be to try to upgrade to a higher quality hang on back (HoB
) filter. It is generally felt that AquaClear makes the best HoB
filters out there. For a tank as large as yours, I would recommend getting two (one for each end) rather than just one. Something like two AquaClear 50's is what I would think. Unlike the Whisper filters, AC
's are very quiet in my experience, actually nearly silent except for the sound of the water hitting the surface water as it returns to the tank. Way quieter than the Whisper filters, though less quiet than a canister filter would be.
I still think a canister would be your best bet. But two AC
's would be a viable alternative as well.