wow what a lovely viv

you obviously have a different strain of mealworm to me (not surprising as most people on this forum are american) but yeah they are the beetle (just with longer antennae). put them in a pot and get the most out of them. if it is consolation, they mean your viv is nice and warm and moist. i had them all over my flat too until i made a new vivarium and had a total cleanout. just make sure you dont leave the mealworm pot open or take anything out of the viv without checking if beetles are on it. also close the door when you handle your lizards.
just one of those things i guess. feed them as much as they will eat and remove the rest to avoid them getting loose and pupating in the viv works but stops them hunting. put the worms in the fridge!