Besides being seperated, do you have a good
UVB light for them? Have you tried the reptisun 10.0? I use the TREX active MVB for my babies. I got a baby from Petco that was super skinny, and wouldn't eat. So I bought some critical care, and syringe fed him for about a week. Then he started eating on his own... Here is the difference in less than 1 month:
Day 1 look how skinny he was (May 9th):
Now this is June 4th (less than a month later):
In less than a month, he grew 1 1/2" and went from weight 8 grams to 26 grams.
He gets 40 reptiworms in the morning, and they stay in his cage all day.. When I get home, if they are gone, I will put about 10 more in, sometimes he will eat 5, but then he's done. I also hand feed him some Collard and dandelion greens in the morning.
Your #1 thing, is get a good
UVB light. Either the reptisun 10.0 or the Trex Active MVB..
Dust their feeders 5x a week. If you decide to use reptiworms, the do not need to be dusted. If using the Reptisun 10.0 you should use calcium with vitamin D added. If a MVB, calcium with not vitamin D.
This is the best advice I have to offer. I have 3 very healthy beardies. If you can't afford reptiworms, definately look into dubias, as they are very meaty and will put the weight on them. But I agree, they need to be seperated. I know this could cost some money, but they are not going to make it if you don't. But once you have the 2nd set up all done, then it won't be so expensive.
I wish you lived around me, because I have extra tanks and lights you could use.
Good luck, and please don't get mad for us trying to help. We are just trying to help you get your beardies healthy and happy, because once they are, you will truly enjoy them.