Good solo fish for 56g

[zeus8807]

Hello everyone, i need help finding a good solo cichlid or maybe pair for a 56g column tank(30x18x24) im thinking something in and 7-8 inch range is probably going to be the top. My problem is most of the cichlids i can find in this range are slow growers. i have had gt's and jds(prob to big) before and both grew very slow. Like many i started out with a oscar an they just never compared. problem is i dont have the room for a proper oscar tank right now so im trying to find something compareable.