Hi Ryan, I went through much paranoia about redleg and my Treefrogs. I've found that they will often climb the glass then let their bodies slide down a little. Then climb a little more, then let their bodies slide down a little. Repeat. This seems to irritate the skin and turn it a little red, especially on the rear thighs (add this to the increased blood flow from movement that's been mentioned). This is also when you usually see them from below and then start thinking about redleg. I went through this several times, but when I check them after they've settled down and have been sitting for a few hours, the redness is gone and my paranoia subsides until next time...