Green terrors are kinda slow growers. They go through growing spurts. Big variaty of food (beef heart, blood worms, brine, feeder guppys, pellets and flake) make sure if you feed live you salt bath first esspecailly if you are feeding G/T. They get parasites easily. Oh and by the way if its a male 11 or 12 inche is more like it. Just take it slow and enjoy this size it will grow fast enough. You might want to upgrade adventually to a 75 I think 75 is a perfect size for single male. spend time petting and hand feeding your G/T and you will have a true water pet. Green terrors are some of the most owner responsive fish and will also learn to do "tricks" for there favorite snack.