My chameleon, keeps falling from his cage and idk if that because he can't get a good grip on the mesh or if it's something else, he is also a dark colour all the time and will sometimes open his mouth and let out a hiss even if no one is there. He has slowed down on eating and won't eat as much as he used too, I'm rly worried about him pls help, also anyone in the UK near Manchester area can u provide me with some good places that have large plants because I can't find any and all of him plants are close to the bottom