Wait... I take that back. Not 1" per month. id say 1" every 2-3" months when they are under 6" or so. Then they slow down to maybe 1" every 4-5 months (just a guess). Right now I think my guy is growin real slow... also i changed his feeding schedule. Every 3 days I fill him up. I want to enjoy him as long as possible so that means slowing down his super Dat growth rate Lol