my fisher is now eating an drinking well.untill i can get a more suitable cage im haveing to keep him in a 56 gal tank.what is sutable to cover the bottom of the enclosure.im useing a mix of eco-earth an peat don't know if that sutable or not.but (why) is he diggin in the substrate an if i build a enclosure would nylon window screen work or should i use the 1/4in hardware mesh.all material is free where i work.im just learning about chams guys.