Fish on its side

[Lofus]

Well after a couple of months of getting my MH in place I finally added a BTA to my tank (Thanks Mitch!).

It looks like it is doing well. The fish on the other hand are a little freaked.

My white cheeked Tang has been swimming on his side all afternoon and my chromis and clownfish have all been hiding in the rocks.

The lights have taken a little longer than I thought and I suspect that the old NO's are the cause of a cyno breakout that also happened today.

Has anyone had the same sort of behavior from a tang after re-arranging the rockwork?

Jim