>>you can use the rubbermaid containers. I house mine in aquariums. babies like to feel very secure. to big an enclosure will make them stress out and not eat. they can do well in a shoe box side container. but i wouldn't heat it with a light. it will get to hot.
>>i have my baby in a 5 gallon size tank. then i have the tank setting on a human heat pad, set on LOW. only 1/3 of the tank is set on the pad so she has a temp gradiant. that is all you need for a baby. well, plus hideing places, little water dish, and a very secure screen lid. be very careful using some kind of chicken wire. they can squeeze out of the smallest of places you wouldn't think they could. i'm just using that green carpet with papertowels on top. works great. all my bigger snakes have the UTH on them. expect my python, she has UTH,plus lights since they like it warmer.
>>it will take a couple of years before your baby is big enough to make use of a 40 gallon size tank.
with the rubbermade or sterilite containers you do not want to try and fashion a screen lid. It will never fit properly.
Use the lid that comes with the container. Just drill a few holes in the lid and around the sides of the box and you're set. If you want a little more security use binder clips to help keep the lid secure.
Use a human heat pad under one end of the container.
provide a hide and a water dish (water dish that doubles as a hide works better)
For a hatchling a 6 quart sterilite shoe box works quite well. As the snake gets older you can upgrade to a 28 quart box and when the snake gets large enough you can put it in the 40 gallon.
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Corn snakes and rat snakes..No one can have just one.
"resistance is futile"
Jimmy (draybar)

Draybars Snakes