Update:
One of the three recently purchased elegance corals is diseased. The other two are still questionable, one moreso than the other. Tonight, I fragmented the sick coral into seven pieces, one fixed as is, one control (no treatment) one treted with an antiparasitic Dimilin 1ml/L, and antibiotics: treated with Gentamycin 500mg/L, one with chlormaphenicol 10mg/L, one with Lugol's 20 drops/L, one with Tetracycline 10mg.L. All treatments for one hour, repeated as necessary every 24 hours.