I know they'll eventually outgrow the 90 . I'm no way going to keep a 16-17" Bgk in a 48x18 . But I also know that all the fishes I'm stocking the tank with are relatively slow growing. Not as fast as other large cichlids. I'm very much aware of the max sizes these fishes reach at maturity. What I was looking for is if the heterospila will be a good tankmate for a senegal or a severum. ThanksIMO they grow too large for either of those tanks. Put them in a 6’ footprint.