You should be fine. I've kept my BRB in a 28 quart (which is only a little smaller than your pvc cage) since she was a hatchling and I've never had feeding problems or noticed any stressing. I can't say I have a ton of experience with them but with the one I have its worked fine. I only have 2 hides, some small plastic fern leaves, and a water bowl. Worst comes to worse if she stops feeding just switch back to the smaller tub.