sinibotia
Aquarium Advice Addict
Honestly, I think that a 55 gallon is only barely big enough for one adult sunfish. They can get 10-12 inches. That's comparable in size to an oscar. They're also incredibly mean little buggers. The only fish mine would get along with was a common pleco that was slightly bigger than him- and "get along" is a generous term for the uneasy peace in that tank.