I changed out the enclosure for my three little brevs. They're about three months old now; the female is 1 3/4", the males are both 1 1/2" long. I had them in a critter keeper, but three days ago I cleaned out my daughter's 2 1/2g guppy tank (a little bowfront) and switched them into it. A little more height, more room for plants to break up line-of-sight. There are paper towels in the bottom. I have a small pothos, a creeping fig, and some kind of succulent thing with largish leaves, several different sized sticks to climb on. They seem OK, but one of the males has turned very dark and stayed that way. He is not hanging out with the other two. He looks really cool, very lichen-y, but he's not lightening up any. Last night I misted him directly to see if that would startle him into changing color, but no go. In the other cage, I would have said he was the dominant male. Does this sound like a problem to anyone?