I have had good luck with the baby food/calcium thing. I added a little pedialyte as well to rehydrate my gecko. Can you post a picture of his poop? Watery doesn't sound good. I hope this guy is in QT faaaar away from any other reptiles you have.

The gecko doesn't look good at all. I am glad he seems to be responding though, and hopefully he will make a full come around. What substrate are you using?