Not really sure yet. I have a keyhole to start with. I'm getting a 20 gallon for a pair of appistogramma Bitaeniata and the cories that I have in a 10 gallon right now. Their health really deteriorated in the 33 gallon. I think it was because of all the waste my pleco gave off despite that I did gravel vacs and small water changes once ever 2 or 3 days.
I was thinking about a blue acara, but I have been to many places, and read many books. Half say 8 inches, half say around 4 inches. I think I will get one, anyway, and if it proves to be too large or uncomfortable in the tank, I'll take it back. Never hurts to try.
Also getting somemore keyholes(hopefully) so I can try and make a pair. I've read they're very hard to sex, why I'm getting 4 or 5 young ones.
I like the rams, too, but I don't have a LOT of experience, only 6 months or so. So I was thinking Bolivian rams or something.
It's still all up in the air lol.