Get them away from each other and keep your calcium 420, mg 1350 and alk 8.3 with extremely low nitrate, under 5. I've had a brain so very dead I used it as structural rock suddenly decide to re-emerge from its own skeleton (which was old) and grow again. Stability and not wobbling is important. Corals don't like to knock about. If you have to do surgery to separate two, make it fast and well-planned, and then treat the injured pieces to good water and stable conditions. I've had a popped euphyllia head regrow skeleton, once I stabilized it.