what about a pair of kissing gouramies? they are really interesting fish
Tank isn't really big enough for
a kissing gourami, and definitely not a pair!
Hoplos are very nice - they would fit well in a 55gal. Again though, you run the risk of a breeding pair. And they will breed. Lots!
I did not realise they were prolific breeders, its till very early days but I've had four ~5cm ones for a few weeks. Absolutely loving them, so bold and friendly, had them eating defrosted food out of my fingers this week!
Have they been known to breed in hard alkaline water like we have here on the south coast?