08-24-2011, 12:46 PM
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Assuming you are looking for fish interest for the substrate level (and not some miraculous "cleaner fish" which frankly don't exist anyway) the suggestions of ladayen and Barb are good. There are hundreds of cory species, and this is a shoaling fish so a group is needed (in your 55g, a group of 20-30 would be fine). There are also a few "odd balls" like Whiptail Catfish, Twig Catfish. The latter needs soft acidic water, the former is adaptable. See the profiles with photos (click shaded names).
Then there are loaches. Some are small enough for a 55g, the Dwarf Loach, Banded Dwarf Loach, Zebra Loach, Angelicus Loach, even the Yoyo Loach and a couple others. Again shoaling, so a group of 5-6 or more. In a 55g I would say 5-6 is fine for the "larger" of those mentioned, but more of the two dwarfs is OK. The social interactions of loaches and corys is amusing to observe.
Last edited by Byron; 08-24-2011 at 12:48 PM..