[CherryBrandy]

I think the light will go out when door closed. Horsfields love to burrow down so it may be a larger box with space for him to burrow., scrape etc. My girls will do this for hours even when reached bottom of their substrate. There are fridge experts on here far better than me who will advise, but Horsfields do like their burrowing so it may account for his activity so don't worry too much. 'Tupperware' as in plastic tubs?? are ok as long as big enough , air holes and dependent on substrate so maybe worth seeing what the fridge experts say...CB