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They get fairly large and mild tempered if left enough room (over 180g). They tend to school as juveniles, but solitary once adults. Will eat inverts such as shrimp once adults. I do like them if you have the space for them.
porkfish would eventually need to be removed as it gets far too big (they dont stay juvies long)...same with your puffer actually, but it should grow slower than the porkfish.