Definately no aquariums. They have bad ventilation, and are not very safe. I have oreo in an about 20x24 inch rabbit cage with two stories. Oreo has never attempted to climb though. I think it's definately large enough. Is it like a ferret cage? The only problem i see is climbng, but I don't know if your hedgie will climb or not. Sterilite containers sound good. You could try the cage you have when you are watching him, and if it ever attempts to climb, you could swich to something else. Good Luck!