As long as he's not banging himself up, he'll be all right in the 40. You should look for a bigger tank, but it's not a matter of life or death.

There are alternatives to tanks if you can't find a big one that you can afford. If you have some basic woodworking skills and equipment, you could easily build a larger home for him with plywood and glass. You would essentially build a plywood box with a 'window' in the front; there are several how-tos online. Because it's a terrarium, it doesn't need to be nearly as heavily built as a plywood aquarium. Just be sure to seal the wood with epoxy or fiberglass resin.

Even easier and less expensive, you can simply use a large plastic storage tub; cut a hole in one side for a glass or plexi sheet and seal it in with silicone. It's not as pretty as a manufacturer's tank, but it is more than adequate for your frog.

Another advantage of the DIY tanks above is that three sides are opaque, offerring your frog a greater sense of security.

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