Bearded dragon advice

[Sophi]

Hey there.

I've recently acquired a bearded dragon. My boyfriend works at a pet supplies store and somebody left him there right before close in a dirty tank full of sand. My boyfriend called me and I came and picked him up right away.

Long story short, I'm pretty sure has MBD as his front two legs are deformed. He walks funny and he's got some weird crooked toes and all in all he just moves strange compared to all the other beardies I've met before.

We were told he is a year and two months but he seems a little on the small side.

I've got him set up now in a 55 gallon with a screen top, a basking spot of about 100-105 degrees and some sticks to climb on and hides to hide in. I got rid of all his dirty sand and now he's on reptile carpet. He seems alert and active despite his deformed limbs. He gets around, although a little awkwardly and has been eating crickets and superworms. Ive also been feeding him dandelion greens, butternut squash,broccoli and raspberries. I've been dusting all his food with calcium with D3 and we got a brand new reptisun 10.0 UVB light for him.

I'm worried about his humidity though... I rent and I only can keep him in the same room as my ball python and my tokay gecko. I also can't get the humidity down in my apartment below 40-45 at night.
I live in Boston and our summers are hot and sweaty. In the day time his heat and UVB bulb keep the humidity down but Im worried he's going to get sick at night. Is this dangerous for his health? A nighttime humidity of 45-50? How can I lower the humidity in his tank without causing a problem for my geckos who I spray twice a day? He has a small water dish but I don't want to remove it because he's actually been drinking from it, which is surprising.

I haven't noticed any twitching or other signs of MBD but he's definitely been neglected for a while and I don't think his deformities came from anywhere else. How does one care for a dragon with this illness? Can he get better?

I've made an appointment for him to see my exotics veterinarian next week but in the mean time what should I do?

Thanks...