It is definitely showing signs of calcium deficiency. The shaking in the limbs is called tetany, and calcium is required for proper muscle use as well as strong bones. At this advanced state, a vet visit may be in order to provide a suitable source of calcium. Simply giving powder supplements may not be enough. Also, giving too much calcium without adequate Vit D or hydration can stress the kidneys.

I would soak the guy in a lukewarm bath twice a day for 15-20 min for hydration. You can mix a little green bean baby food with water to make a slurry and feed with a dropper to get liquids in, too. Check out the Iguana Den diet for a good list of veggie to feed. The 10.0 is good, but needs to be 6" away. The best thing will be natural sunlight, as unfiltered as possible. My lizards bask outside in a 1/2" mesh cage that allows more UV to get through than a fine mesh screen.

Good luck!

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