feeding

I have a 7inch map puffer. He's not on a scheduled diet right now, I've had him for two months now. At first I was feeding every day. Now for about two weeks it's been every other day.
I want to know how many times a week should I feed him and how many times a day.
It seems to me sometimes I'm not feeding enough because he eats what ever I put in there and I don't want to overfeed him.
 
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