Oh, that light should be about 10" or so above the top of the plants.
I wouldn't pull anything. That happens to me quite often that the seedlings are to spindley they can't support themselves. Take a piece of wire, or anything and give it a bit of support, not that it was to be straight up, but you what you don't want is the stem of the plant laying flat on the rockwool, that will kill it. They'll stiffen up as they get a bit older.