You said...he has supplements dusted on food once a week...I dust with a phos.-free calcium powder at most feedings. Most insects that we feed them have a poor ratio of calcium to phos. so this helps to make up for it.



I also dust twice a month with a vitamin powder that has a beta carotene source of vitamin A. Beta carotene sources won't build up in the system but preformed vitamin A can. Excess preformed vit. A can also prevent D3 from doing its job and lead to MBD.



Since my chameleons get no sunlight, I also dust with a cal./De powder lightly twice a month. D3 from supplements can build up in the system too....so don't over-do it.



Do you have a substrate in the cage?

Are some of the insects you feed him WC?



He might have picked up a parasite. Parasites can not only cause constipation but bloating. Sometimes parasites can cause a prolapse...so if he is strainging to poop...I would worry about this happening.

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