I havent cared nor taken care of many of the fish stated, AND one thing for sure is some fish do take a while to get use to, even if you dont own them. So Uaru i always liked, the big peaceful moody nature is very attractive for me, and its not as common as discus. I have Uaru cf.sf.A Orange. I love peaceful cichlids and fish that are very unique and have there own behavior. Like my Cochus BLUE tetra is SEVERELY UNDERRATED. THey are so active and behave so uniquly in the current compared o my older tetras.
What I dont like are fish that are TOO aggressive to even go in with any tank mates what so ver. Like Vieja are not in that catagory. Too agro fish would be.......... Many(But not all by far) Pike cichlids, the smalle species go around picking fights they can't win and one ended up dying. I am actually happy that most non-mainstream fishs are the best fishs, so my tank looks exotic even to regular aqariests. Like Guianacaras, Hoplos, Uaru, Certain tetras, Curare Severums (The only good looking one), Pinecone Pleocs, etc. One thing is sometimes from just watching videos and seeing pictures and reading about a fish it can grow on you. I though Eques Corys were ugly, they resembled a bronze cory too much. But after i started to notice the white underbelly, the much more perfect looking irredesence, the more sloped head, AND the bright yellow spot that is even more prevalent then any other corys, more then adolfois and dulicarious. plus aquarium Glasser theorizes that the yellow spot is for the school of fishs to stay together rin blackwater environment.
When comes to looks there is 2 things i noticed, there are eye-catching looks and elegant looks. Elegant looks are like Uaru, they aren't all that colorful but they have a royal look almost, the perfection of the orange, dark blue spot, the large fins, and the lining of iridescence.