http://www.fishlore.com/fishforum/fish-tank-filters/
Good morning. Above is link to the "reviews" section of the forum that you may find helpful.
I have to respectfully disagree with Agabr concerning how long HOB filters last. I have an old Whisper 5 that has been running not stop for 10 years.

Personally I like the Aqua Clear (
AC) HOB and think they do a tremendous job. The AC 110 has a 500gph and has soooo much room for bio media. Very quiet filter.
Extra filtration is always good as long as your fish aren't being blown around by the current.

You want filtration to be 8 to 10 x the volume of your tank. 55g tank should have 440gph to 550
GPH or more.

Ken

to Fish Lore!