1.5"-4" in 3 months? Kewl. That's all of second year's growth up here.
Here its something like:
Year 0= 1.5"
Year 1= 4.4"
Year 2= 8.3"
Year 3= 11.4"
Year 4= 14.0"
I figure they'll get 10"-14" next year for you if food is good. But then again its only august and thats a vague guess. You probably still have a few more months. So long as food supply is good you should be fine and do better than that. A vet/pro could tell you more about feeding them but once you start, which is hard enough to do, you can't stop feeding them without problems.
