Because you're running carbon, and because I keep all the different corals (SPS, LPS, softies, anemones, you name it) in one tank without issues, I would say any problems are coming from something other than chemical warfare. IMO/E, the warfare between soft corals and hard corals is really overplayed. Certainly, they all compete, but I've found that hard corals can have as much of an effect on other hard corals as soft corals (with some exceptions, of course).