What wattage over what size aquarium with what lamps and how old are the lamps. Although I agree that most, if not all Faviidae survive & thrive under Power Compact flourscent lighting, this is just one of several parameters when considering this, or any coral. Echinophora naturally occur in moderate to bright light conditions with strong water movement - current. Both of these conditions are very do-able for most aquariums but are these conditions appropriate for the other corals your already have or may want in the future? I saw you mentioned that you have zoanthiads and I think you have a blastomussa and tubestria, which do not want strong light or current but some thoughtful re arranging could remedy that concern (ie putting them lower and out of the stronger light & current for example) Another consideration would be the water quality parameters, What are they are how are they being maintained at that value? LPS, though many are fairly easy to maintain, there are parameters that must be achieved and maintained for long term success and growth. I'm going to assume that the basics are correct (ph ammonia, nitrite, nitrate) What about phosphate? This is a LPS coral, what are your CA & ALK levels, & how are you testing & maintaining them? What will you be feeding this coral?