fish with a very long life span. so koi, goldfish, plecos, aros, etc
i also like carp descend fish because of there hardiness. really koi and goldfish are probably the only true domesticated fish. much like we have deomesticated dogs.
if you know other domesticated fish i would love to hear about them.
goldfish and koi can really eat anything you eat really. i remember feeding goldies potato chips as a kid.
glass catfish, now those are cool. perfect fish to have if you want to focus on a planted tank instead of flashy fish.
green glofish, this may sound stupid but i like the green because they look like they could almost be natural in coloration. also because there gm
clown loach.
cichlids. the one type of tank ive never done, ive only had 2 cichlid a lelupi(favorite) and a lombardoi that killed the lelupi. those were both when i was young and didnt research. i like that there mooth brooders
discus(yes i know this is a cichlid too) i like the colors, and i like that the parents can feed them slime
saltwater fish like the colors and personalities(most are probably similar to cichlids), i dont mind the high cost of equipment for reef tanks so much just wish the salt wasnt so messy.
asian aros, the body shape on them is exquisite
i do like gouramis a bit, there pretty cool looking with there feelers