I think he has maxed out. He is very thick and proportions look good. I hope he doesn't grow anymore. A 120 gal
. Is probably all my wife will go for. Don't believe everything you read about max sizes of fish. Before I bought my red terrors all my research showed max sizes
20" male, 13" female. Too aggressive for community tanks. I held off buying until I discovered a thread from an actual scientist who had done field work in Ecudor studying the Red Terror. His research showed the avg. Wild RT. is 9" long. In short I bought a group of them, found them less aggressive than convicts. Here is a shot of the GT with my largest female RT.