I have 2 chameleons, 1 male and 1 female that live quite happily together. for the last few days my male chameleon has been mostly lying on the bottom of their tank, i picked him up yesterday and he was rather cold, hes doing the same thing today and i picked him up and he wasn't as cold but still not very warm. the humidity is fine, temperature is fine, uv is 6 months old and may need changing now but the female is absolutely fine so i don't think it could be that, and hes eating fine as well. i looked it up online and the most likely thing is metabolic bone disease, but he has a very good grip, has a normal jaw and i dust everything they eat, and like i say the female is completely fine. i have no idea what it could be, any suggestions will be appreciated, thank you.