I've had a difficult time figuring out how these things should be fed, as they seem to have a much faster metabolism than a Pacman frog, and a much bigger appetite too. What I finally decided to go with was a regime similar to what one would do with an African bullfrog. I feed it two days in a row, and give it a day off on the third day, not that this has kept it from biting at the glass, biting at the water and biting at her large rock.
Quite recently I trapped several minnows from the lake, and it ate eight of them in a row in less than 20 seconds...my plan was to put some in there, let it eat what it would and scoop the rest out after it was done. SO much for my plan. Even after eating a full grown mouse, it would eat again if I let it. She has a hernia, but that doesnt seem to bother her at all as far as eating goes. If anything, its just extra space that food can fit into....
It was about three fourths of an inch when I got it on June 25th, and now on August 8th, just a bit over a month later its four inches long....
Protozoa can cause prolapse, and runny stool is a sign of protozoa, so you should monitor for any more runny stool and get it treated.