it's not infection. I'v been keeping an eye on the limb and it's gone through all the appropriate stages for regrowth. The limb was bit, turned white, fell off, shrunk to where a portion of the bone was sticking out, the bone broke and fell off, the skin grew around the bone area, leg started to lengthen, 2 toes formed, and currently his third toe is beginning to grow. The leg is not swollen, oddly colored, and he is using it regularly which gives me an impression that the leg has nothing to do with his current state. When I first got him he wanted to crawl out of the water a lot (I think I purchased him as a young adult so it seemed normal) but he never came out for more that a few days. My female on occasions likes to crawl out and bask, but for no more than a few hours every couple months. I realize that there's probably nothing I can do except for wait and see, but I thought that there might be a chance that someone might know what's going on. Thanks so much for the help so far!