if the heads are falling off the stalks, your expiriencing Polyp bailout, a last ditch survival response for a coral that finds itself in unfit conditions. Euphyllia are one of the many corals that can accomplish that. place the ditched heads in a low flow area, they will eventually grow their own skeleton, if you can keep them alive long enough.
unfortunatly that leaves many possible options for the problem.
Lighting, water quality, flow. (lighting is the least likley possibility)
I would suggest its a water qualiyt issue if your water is cloudy there is a problem somewhere. test all your parameters. PH, alk/kh, calcium, am, nitrite, nitrate, phosphate, etc. the more exact conditions you can list the better chance any one has of helping you find your problem.
also, I see a rather good size clown in the tank, is the clown hosting in the frogspawn? a large clown hosting in a frogspawn can seriously damage the coral and possibly cause bailout.