I got him 3 or 4 months ago at about 3in. Now hes 4in. Why is he growing so slow? i feed him frozen brine shrimp 3 times a week, massivore delite every other day, algae wafers once a week and he has a constant supply of feeder guppies whenever he want. His diet is varied and hes in a 20 gal because in my larger tank hell get eaten. I just dont understand why hes growin so slow. is this normal growth rate for a TSN?