Thank you, Wesley. I have tried the lukewarm (treated) water, but so far nothing. I can't even say whether he has eaten or not recently, though compared to his tankmate, he is definitely skinnier. When I removed him from the main tank, he didn't try to get away, and he has been in the same position since barely hopping off my hand 8 hours ago. He is still breathing, but barely. I was going to put crickets in with him, but they might stress him out even more at this point. Regardless, it is not looking good... Thanks for your help, though-I really do appreciate it.