My RBTA is absolutely HUGE. I don't have as many corals as you do but I do have some. When I moved it into my larger tank, I tried to replicate its location, lighting and flow to the same as the tank it came out of. Didn't work. It stayed for a few days, then started to wander. from the rocks, to the sand, to the front glass, back to rocks, back of tank and ended up exactly where it started. All this within a week or so. I kept an eye on it around powerheads, but it seemed to move with its foot remaining attached, never saw it floating around.
I don't think there's any way to predict what a nem will do until he decides to do it. Yes, mine stung corals along the way, but nothing died. While he was on the move, he did not fully inflate. Now that he's happy, he's probably close to a foot + wide with tentacles and still growing!
On another note, this same nem was happy in one location in my other tank for the longest time. Then it decided it needed a new spot and was on the move, 6 months or so later. So what may be good today, not so much later.
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