My plastic box is the same size as a 40 gallon breeder glass tank hes 36inch long so i put him in a plastiv box that is also 36 inch long so he could stretch out thats what everything i research told me to doand i have turned to heat down to 89 and we are going to walmart tonight for a smaller sterilite box i just thought he was happy because when the lights go out hes all over his cage..