Is my bearded dragon underweight?

[Meganbeaudry99]

I just took in a new bearded dragon named turbo. He is 3 years old and about 240 grams. I took him from my friend because she didn’t have time for him any time for him. He looks pretty skinny for his age and like he is dehydrated. She was feeding him like 50-80 crickets whenever she had crickets and then I guess just blueberries occasionally. He doesn’t really like greens

or veggies I’ve been trying to feed him. And he hasn’t had a bath in a while. She also doesn’t remeber the last time she replaced his uvb bulb. He’s in a 40 gallon tank with sand and a zoomed double dome fixture. I’m trying to get him more stuff for his enclosed at the moment but money is tight. He just has a basking spot and a log at the moment. I also have a 4-5 month old bearded dragon named Lenox and whenever turbo sees him he black beards and goes crazy and scares Lenox. I’ve been cover the front of turbos encloser so they don’t see each other and then cover lenox’s when I take turbo out. I don’t know if there is anything I can do to help that.
Here’s some pictures of turbo

 

[AHBD]

Hi there, Turbo is a bit small for his age, what is his length ? BTW, are you positive it's a male ? Can you post pics of his set up ? He may have a slight touch of MBD as well, calcium deficiency that makes him/her look a little bit weak. As long as you feed him well now + offer water by soaking for 5-10 minutes twice a week [ supervised at all times ] so he can drink if he wants then he should gain some weight + strength.