Re: Can't keep bees! (need advice)
If your top bar is doing well than take a frame from it (preferably with some brood) and put it in the Lang. I don't know if they fit but make it fit or cut it out and rubber band it in a Lang frame. Bees would not select a home with foundation in it. The plastic is even more of a detriment. A drawn brood comb or two will give them an incentive to stay. I think with brood in it the nurse bees won't leave and that keeps the rest of the colony stuck.
Zone 5a, Practicing non-intervention beekeeping