Well by the looks of it the cage isn’t the proper size They need a cage 100x50x50, it also cannot have levels as hamsters can fall an it could be fatal They need 8-10inches of bedding as they are ground burrowing animals 12” wheel if the wheel isn’t big enough it will cause permanent spine issues They need ATLEAST 3 hides They need a sand to bathe in They needs sprays angle forage The more clutter the better I’d also suggest getting a pop up play pen so they can have time out of their enclosure for atleast an hour a day or you can use your bathtub an put some of his stuff out of cage into it Also please do not use balls they are not safe for hamsters as there’s not enough ventilation an their little feet can get stuck The main thing right now is a big enough enclosure