No, he's suffering from a calcium deficiency due to a lack of
UVB light, not Inclusion Disease...Yes, the Sunblaster hoods are very good, that's the same exact fixture I have, it's great because it has the fold-out reflector and it comes with several different sets of mounting hardware for mounting any way you might need to. Just make sure you get the correct length, so for a 22" Reptisun 10.0 T5HO you need a 24" fixture, for a 34" tube you need a 36" fixture, etc.
Dragons need 13-14 hours minimum of strong
UVB light and a bright-white colored basking light set up right alongside each other, both lights sharing the top of the Hot Side of the tank, with his basking spot/platform positioned right underneath the lights. Without adequate
UVB light they cannot absorb any of the Calcium you feed them in their food or in a powder, they just excrete it. So this causes their bodies to start leeching the Calcium from their bones, and they start to lose their appetites and become lethargic, and the next symptoms are tremors/twitching, weakness in their back legs and back ends (some cannot push out bowel movements unless they're in warm water due to a lack of muscle strength/contraction ability), trouble with nerve impulses, basically issues with any bodily functions that involve calcium.
I hate that they sell so many damn UVB bulbs and label them as being okay for Desert Reptiles, that 13 watt Compact Reptisun 10.0 being the most common one. The only way that bulb would be adequate was if you have it within about 3-4" of him with no mesh lid or anything else between the bulb and him, which then causes eye and neurological issues, so you can't do that.
In the meantime while you're waiting for the new T5 UVB tube and fixture to arrive, just take the mesh lid off of the tank, he can't get out, and put that 13 watt
UVB bulb over his basking spot, along with a bright-white colored Basking Bulb that will keep the Basking Spot Surface Temperature around 105-110 degrees F, no higher than 110 degrees, but you must be using a Digital Probe Thermometer to measure this, not a stick-on...All pet shops sell the Digital Probes for about $10. This is crucial as well, as obviously desert reptiles spend all day long, every day on rocks basking under direct sunlight. That's what you have to replicate.
So get that
UVB light that you have on him with no mesh lid in the way, try to get it within about 6" of his basking spot/platform if possible, and leave both the
UVB light and the basking light on for 13 hours a day. Do this until the proper UVB tube and fixture arrive. He'll at least get some UVB/UVA light this way, it may help a bit.
If you live anywhere it's warm outside, at least 60 degrees, getting him outside under direct, natural sunlight for an hour is just about equal to a day under the artificial tubes, so that would be awesome if it's possible. I live in central PA and it was 72 here last week (weird), so hopefully this is possible where you live until the new UVB tube/fixture arrive.
Also, please start dripping water onto his snout so that it run down over his lips and see if he'll start licking it off. Keep dripping it as long as he'll keep licking it off, give him as much as he'll drink, and do this 2-3 times every day to keep him
hydrated.
If he's not eating at all on his own, you'll need to start using an eyedropper or oral syringe to also get some nutrition in him, you can start with just buying some jars of Baby Food, like Squash, Peas, Green Beans, Sweet Potatoes, etc. Those are the ones they usually like. Add a good pinch of Calcium powder and a good pinch of Multivitamin to the container of Baby Food, and a little water to thin it out, and drip this on his snout to lick off the same way as the water, and do this 2-3 times a day as well, letting him have as much as he'll lick off.
He probably isn't going to perk-up much until he gets under that new UVB tube and his lights are set up correctly and his temperature zones are corrected, it usually takes a few days of being under the T5 UVB tube and the correct lighting configuration and temperature zones for them to start to recover, but he will. People don't realize how crucial UVB, UVA, and calcium is to every function of a desert reptile's body, simply because they naturally live under direct, strong, natural sunlight every day of their lives, and that's what their bodies are built for. So if they are deprived of any of these factors they cannot survive. And the light manufacturers certainly don't help matters, not only do they not tell you that those 13 watt Compact UVB bulbs are inadequate in the first place, they also don't mention having it within a very close distance to them and not having it obstructed by anything either. As you had that 13 watt
UVB bulb set up, he was basically getting no
UVB light at all, and that's why he's so ill, but it's not your fault. Nor is this uncommon, it's the #1 post on this forum and the #1 cause of dragon illness, easily.