ok well i have all my leopards on sand 0.8-1.2 mm and it works very good... i don't like having them on anything else except for the juveniles which i have on paper/wet cloth... and i don't feed my geckos with in a bowl i just throw a few vitamindusted crickets in there and let them hunt them... that could be a thing also that he's not triggered to bite cause he doesn't get the "chase" situation... my snowmale did the exact same thing he just turned away after a while so i started feeding him with one cricket at a time that he chased and then ate....
hope this helps a bit...
/marcus

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