I used to have a white's tree frog that I adopted from a co-worker that didn't want him anymore. He was great - sat out in the open all of the time, good green color, ate well, etc. After several years I was trying to fix up his tank a bit by adding a waterfall. I must have done too much and stressed him out, because the next morning I found him dead in the cave he used to sleep in. I was sooo sad

After redoing the viv and waiting several months I got two new white's tree frogs. These two are so shy (or scared) that they never come out into the open when it is day time and spend their time in the darkest most private areas they can find. Also their color is much more brown than green. They seem to eat fine and are moving around at night (poop in the tree branches and dirt in the water bowls), but I basically never see them unless I really hunt. When I need to handle them on occasion to clean their bowls or the side of the tank they seem very scared and immediately pee on me or try to get away.

Why would they both be so different than my first frog? Maybe caught from the wild and not bred in captivity?

I always have fed my frogs by dumping a bunch of crickets into the tank, so they can hunt them down. I don't feed them in a separate dish or with a tweezer as I have seen some do. Would it help to try hand feeding them?