When it's too much, they will "blow up" a whole corner of the enclosure with something that looks like it came out of a rottweiler.
When I was feeding him every 7 days with a small he would have these small dog sized turds, 3-4 inches long that really looked like a dog had gotten into the enclosure somehow. It made me laugh but also I was like aaah maybe you're eating too much lol