Day 4 of pedialyte soaks, have lots of small-medium sized crickets and a bowl of small meal worms in his cage. His color has improved, he's active at night, but still no eating. No fecal matter has been discovered, and I just caught him sleeping at the bottom of the hospital tank.
He seemed to be getting better, only to relapse into the same behavior. Not sure what is wrong. Females in the terrarium are doing great. Good appetites and active.

I don't know what is going wrong. I try to do everything that I can to keep them happy, yet the males keep dying. I hate that I can't figure out what I am doing wrong that they are dying.
I can only think of two possibilities: 1. I had water collecting at the bottom of the tank before putting in the clay substrate, may have caused stagnant water to cause bacteria build up. This is doubtful though, it never got too bad, and I cleaned their terrarium regularly and tank never got a bad smell. Also, the female specimens I have are doing great.
2. We had a cold front come in the past two weeks where I live, so their cage temperature dropped 5 degrees night and day as we were not running the heat in our house. Temps fell to 77 during the day and 69 at night for approximately 5 days. Maybe the smaller male specimens are more sensitive to temperature drops. I really don't see a 5 degree Fahrenheit temperature difference causing the death or illness though.
Otherwise, I'm doing a big terrarium build in the next couple of weeks. Complete with a very large Exoterra tank, driftwood, great stuff background, live plants, the works. I was planning on ordering more Red Eyes to go into the new terrarium, but if I can't figure out what is causing the males to die, I might have to put my White tree frogs in the new terrarium instead of more Red Eyes if I can't figure out what is going wrong.
I really hate to do that though. I have always wanted to keep red eyed tree frogs as pets. Now that I have them, I hate that I'm doing something wrong that keeps killing them. I have done everything to the exact specifications on every care sheet I have read on these frogs, yet the males keep dying, while the females flourish.
Any help would still be greatly appreciated.