Acropora commonly grow next to Sarcophyton, Lobophytum, Cladiella, etc. in nature. Euphyllia rarely if ever does. That isn't mere coincidence. The terms "lps" and "sps" are totally and utterly useless when talking about tolerances, behavior, requirements, etc. Actually, they're totally useless terms for anything I can think of.
Everything mentioned certainly helps, but sometimes corals will not coexist no matter what one does. Typically the dwell times for water on reefs is only a few hours yet allelopathy works very well there. Do we really think we're going to undo these interactions with meager water change schedules, activated carbon, etc.? I really doubt it, though we might be able to create an analog of nature by using these methods.
Chris