yes it did........... haha this is the first time i've tried to narrow fish down with someone haha but i think its working.
you could do some hujeta gars, ctenolucius hujeta, they are get about 10-12" and grow very slow, they do not need feeders but some may only accept feeders. (i was lucky mine loves freeze dried krill) but that would also need their tankmates would have to not be able to fit in their mouths but not be able to eat the hujetas
a good catfish that could go with hujetas or be another fish for you (maybe) is the striped rafael catfish, platydoras costatus, they get about 8"
alot of the geophagus species can survive in a 55 for life
if you want a peaceful oddball tank you could do very unique cory cats like pandas, sterbai, arcuatus, metae, haraldschultzi, etc. you can also do dwarf cichlids like rams, apistogrammas, kribensis. also there are some unique tetras, like the blind cave tetra (not at all colorful, but IMO very unique how it has evolved to have no eyes because they were not necessary), a large school of cardinal tetras makes some people (including me) go "WOW!", and my favorite rummy nose tetras they're cool little tetras, but then there's the amazing Poecilocharax weitzmani, a rare tetra. there's also some cool pencilfish out there.
there also are elephant noses, gnathonemus petersii, that get about 8 inches and from what i hear are peaceful,
african butterfly fish, pantodon buchholzi that get about 4 inches and stay at the top of the tank just under the water line, can be predatory
south american leaf fish, monocirrhus polyacanthus, gets about 4 inches and is predatory
asain needle fish or just "needle fish", xenentodon cancila, gets about a foot long, is predatory, could be housed in a 55 gal for most if not all of its life.
halfbeaks, nomorhamphus liemi, gets about 4 inches long, can be predatory.
leaf fish or african bush fish, ctenopoma acutirostre can get about 6 inches, predatory
other bush fish, of the species ctenopoma, predatory
pike cichlid, crenicichla sp., predatory, can get to about 10 inches
pike cichlid, crenicichla lepidota, predatory, can get to about 8 inches
green terrors, aequidens sp. "gold saum", predatory, can be agressive, gets to about 7 inches
severums, heros severus, peaceful, can get to 8 inches,
flowerhorns are also another choice
this is just a few of what could possibly be kept in a 55 gal for most if not all of the fish's life.
there are more, do some research online to get more information.
either google a fish or go to an online store (like thatpetplace.com, petsolutions.com, or liveaquaria.com to get the maximum length of a fish.. typically you would not want fish longer than 10" but could get fish that can get to be 12" as a typical 55 gal is about 13" wide........
hoped this helped


