Liam, I'm glad to hear that you're looking into a better way to take care of your dragon. The Reptisun 10.0 tube you have is the right UVB, it's the temperature that your dragon is under that's incorrect. It's great that you rescued this little guy from Pet Smart, but you still need to make sure he has the right temperatures to bask under, as that will affect his digestion which in turn affects his ability to eat. I don't know what your monetary situation is, but dragons cost $, that's a fact. The Accurite thermometer with a probe isn't expensive and you can find it at any hardware store. The probe is put on the basking spot 45 minutes after you put the basking light on & it will accurately tell you what your temperatures are. It's important that your little guy has at least 105F at the spot where he's sitting, so he gets the warmth he needs to digest his food. A 10 minute
bath is fine, but at the proper temps he'd need a daily
bath, just because he's still little. If the temps aren't high enough, then you need to get a bright white household bulb with a higher wattage and we can help you with that. Not having the right temps (and your dragon is probably too cold at 90F) is essential for good digestion.
So please get the proper thermometer, as it's impossible to guess the right temps. Crickets are ok, mediums would be the right size for him at his age. Mealworms aren't nutritious enough for beardies and their shells are very hard to digest. Supers are for bigger beardies, I didn't get mine any until they were a year old, but 16" long is the minimum recommended length for them. They'll be good for him when he's bigger, it's what my 6 dragons eat, plus dubia roaches. Greens daily, as everyone has said &
www.beautifuldragons.com is the best nutrition list around.
I hope all this information helps. And it's important for your beardie that you give him the right temps to start him off right. If you're worried about him being impacted, then when he's in his daily (that would be important)
bath, massage his belly from his chest down to his vent (where he poops from) and that will get his digestion working. You can also feed him canned pumpkin, without spices, it also helps with digestion. Having your first dragon is always difficult to figure out what's best for him, but the people who have been answering your questions are long term dragon owners and we've all been where you are, wondering what to do. I have been rescuing dragons for 7 years and have 6 adult males, one that is being treated for Yellow Fungus, so I know all about expenses for a dragon. So to keep him healthy, please follow what we're suggesting.
Take care
Deb