context: if there are shady areas he can move to ( for example a 3 x 5 x 4 tank with light on one side ) then you can leave it on a full 12 - 14 hours , if it s a small tank and he ca n't escape the light then 4 - 6 at most at a time though quite possibly 4 - 6 hours at a time twice a day .
hypothesis: The scaping happened