Thanks guys for the advised if it went too big over the next few years I think I would have to donate it to the zoo then haha:)

I have a bany 3" Asian red tail catfish in a 150 gallon tank(don't worry I have a pond ready for him when he gets bigger cause the pond is filled with many adult Arowana) may I know what kind of food should I feed him to make sure he has a healthy diet cause now I am currently feeding him frozen ...