I have a GT in my 125 with other fishes.Good personality,curious george,battles my blood parrot,chases other smaller fishes at times.Overall they're great to have in a cichlid tank.
I have a GT in a 90 with a Jd, firemouth and con. They will be moving to a much larger tank in about 2-3 months. They all get long for the most part but they are cichlids. Jd runs the show. Problem with most SA/CE cichlids is even the smaller species like cons and firemouth can reach 6". And they require space being cichlids.
If you know you're going to get a bigger tank then firemouths or severums with a medium sized pleco. L75 para is a wonderful pleco that reaches 10" and doesnt typically hang on the glass/acrylic. Very active in an active tank.