I wouldn't recommend the pinkies either.
A few other notes.
Sand is dangerous. It has a risk of impaction. Also, sand can harbor bacteria, and other nasties.
What uvb light are you using? A lot of uvb lights have been known to cause problems with dragons, and only two are highly recommended that I know of. Megaray for an mvb, though they have had a few issues within the last year. Though the reigning king of uvb light due to reputation is the reptiSUN 10.0 (not reptiglo).
Also, I can't check right now due to the site being blocked at work, but here is a great resource for what is good for dragons.
www.beautifuldragons.503xtreme.com/Nutrition.html
Also, I wouldn't feed spinach, considering, while high in calcium, it contains oxilates that bind to nutrients and prevents the dragon from absorbing them.
Mealworms are a terrible feeder. They don't have any nutrition, and are very high in chitinous shell which can lead to impaction. Superworms aren't that bad, they have more meat in them, but only for dragons of at least 16" in length. Crickets are alright, but I personally don't like them for a few reasons.
Try getting other greens such as collard, turnip, or kale. Supers are alright, but fatty, so not too much. As mentioned crickets are good, but I don't use them because they smell, make noise, are too good at escaping, and if left in the cage overnight with the dragon, will start munching on your pet. Myself, and a good number of other beardie owners would recommend blaptica dubia (yup, a roach) for a feeder. They breed very easily, and live awhile, so it cuts out on the feeder bill. Also, they can't climb, fly, jump, don't smell, don't make noise, and are very healthy for your dragons.
I would also say to get rid of the sand asap, you can replace it with repticarpet or papertowels for now. Another popular substrate is actually slate tiles. they are easy to clean, no risk of impaction, and help keep your dragons nails trimmed, as well as look nice.
How old is the dragon, and how long is it? A young dragon will have a diet consisting of mainly insects, but salad should be introduced daily. As the dragon matures, and enters adulthood, they will need to be eating about 80% of their diet as salad, with the remaining 20% as feeders. Salad should be offered every day, regardless of age.
Hydration, they don't need a water bowl in their viv. If humidity gets too high in their set up, they can get respiratory infections. A ten minute bath every day or two will keep them hydrated. Even if he doesn't drink in the bath, he will absorb moisture through his vent.
I hate to link to another site, but beardeddragon.org has a lot of caresheets, and a large forum community that can help with anything on your dragon.