yeah if they are fixed ballasts you may need to add some support to that pole you hang them from. go to home depot and have them cut you 2 2 x 4's to the exact height of the pole you hang your lights from and use the 2 x 4's as supports near the edge of the pole by the wall of the tent. shuold cost you $5 and add a ton of support and make it nice and strudy.
as for the mites different room or not you risk infecting your plants those fucking bugs will get on your hands, clothes, ride air waves from fans etc. i would mix up some
floramite or at least some alcolhol/water mix and completely dunk that thing in it to make sure you kill all of them. do it every 5 day or so and it should be bug free soon enough.