I have had a hippo and yellow in a 90 g. Both started at 3-4 inches and have only grown an inch (at best) in 2-3 years. I think I feed a bit sparingly but there has never been any aggression etc.
I imagine genetics, food type, and cough... tank size... play into it. I just upgraded to a 150 g so it will be interesting to see what happens to growth now.
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