Just throwing this out there. We had a red montipora sold to us as a capricornis but it turned out to be hodgesoni. It grew in the same fashion as yours and could be grown anywhere in the tank.
My "cap" is doing the same. Looks like yours and the OP's is at least plating but just downwards. Mine's just encrusting. Ive read that it may be due to high flow and it's just encrusting to handle the high flow. I guess I'll have to wait and see.
