Thanks for the answers guys, i guess mine is not hungry, sometimes he takes 3 4 days after a big cricket to eat again. He does not poop often either, maybe once a week. Maybe he stores some ahahah.
So i tried both, no difference, he does the same, light or no light is the same, i'll keep trying until he decides what he prefers.
Do they actually sleep?? I never see him with the eyes closed actually... And how do they sleep? Even at night, my frog moves everywhere, into the pool, he goes borrowing, he's active day and night ahahah.