How old is Bob? Is he old enough to be pining for a girlfriend? When they reach sexual maturity, they may act a little depressed for awhile, until the mating urge passes.

I'm sure he's fine, but only he knows for sure. Without any actual symptoms to talk about, the best you can do is continue to keep an eye on him and double-triple check to make sure his temps and humidity levels are spot-on.

Just out of curiosity...why didn't eco-earth work out for you? I use it for my cape and love it...but I keep it very dry because he doesn't need any extra humidity.