well the other chance is that most chams will darken up when they are trying to absorb more light mine does this any time he wants to soak up all the rays and heat he can
reason i asked is i recalled other threads with same problem cham going to top and letting go, i belive it was a supplement issue was givingn to much of one thing but it its repashy calcium plus thne you should be alright, as for why your cham is doing it you will have to wait for a senior...
well that poop color looks a little off to me, you said hes been eating the leaves that might contribute to the lighter color, are his urates still nice and white?. and without seeing a picture of the area id have to say its most likley a sperm plug, any chancce you can get a pic up would help a lot
pics
got some pics after shed not very good pics but im getting a real camera so ill get some better ones
last Pic is of the new shefellera i had to buy due to accidently almost killing the first one, im gonna try to save it though