It's more like 40 gal!

Seems a little too big for a 22".

What do you say to getting a small sterilite/iris/rubbermaid tub, until the snake is a bit bigger. This way he won't stress out too much.

You can just put a heat pad under one side with a thermostat until he's big enough for that exo-terra.

Please ask more for info if you need any!!