Just throw some crickets in and watch how many he eats before they start drowning, then start limiting feeding to around that amount. Also might want to try earthworms. They're a pretty easy frog to keep, sounds like you're well in hand. I've kept them without supplimental heating, so thats not a real issue. Just keep their environment clean, any bacterial buildup will be detrimental. A very secure lid is also a must, they will jump at a top until it gives - and they are much stronger than they seem and the height of a 10 or 20 gallon tank is no problem for them to leap over.
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