Your cham is dehydrated. You need to mist him a LOT, and I mean a LOT. You can also give him a shower. You need a plant for him, and then you put him in the shower. The shower should be room temp and pointed so it hits the wall, not the cham. The mist from the shower can hit the cham, but you do not want the heavy stream from the shower to hit your cham. Also make sure he has a dripper that drips several hours a day. If you do not have an automatic mister, them try to mist him at least 3 times a day for 15 minutes. You will be able to tell by his next poop if he is rehydrated. Good Luck, let me know how it goes.
What suppliments are you giving him?
Are you using Repashy Calcium Plus by any chance?
Well, you know how if you take a multi-vitamin/mineral tab, and a few hours
later, pee bright yellow?
It's the water soluble vitamins and pigments that disolved and came out.
Same with your cham. Some food and suppliments have water soluble pigments, like paprika concentrate in the above mentioned calcium plus.
These things can tint the urates yellow, orange, and even red.
Besides all that, as already said it could be dehydration setting in, 'fatty' area's, like around the eyes, will start to shrink and the eyes may look
That will tell you your cham needs water right away.