Ok so i recently bought a new 16x16x30 mesh cage for my 2-3 minth old vieled chameleon and he has never shown any agressive behavior until now. He used to live in a small 10 gallon terrarium and he was always fine with me handling him and would always be a light green color but now that hes big enough for the mesh cage but everytime i try to even get near him he hisses at me and acts really agressive. The real problem is that he is never green anymore he is always a greyish brown color, as if he is stressed. I need help anyone know what could be causing this?