Hi, the cage sounds ok, will they spend any time out of it and do they have permant access to the run?

As for salt and mineral licks, I have never found a use for them, and I think they can be very dangerous due to the calcium levels in them. As long as the bunnies are getting a good food for example Science selecitive, Allen and page or Burgress Excel pellets and goog hay and some fruit and veg they should be fine.

Are you getting males or females or one of each?