Yay for sinking poo! LOL
At least you have poo.... I've left my guy in his 3 gallon tank, but lowered the water level, and turned a silk plant on its side so it provides cover for him. He's still not doing well, but he didn't look quite as bloated this evening. But he has NOT pooped yet. I may go to PetSmart tomorrow to see if they have frozen daphnia. (Although I don't think he wants to eat right now...)
Glad to hear that your little guy is doing better tonight!