falling apart

Hey all! I was fortunate enough to pick up a Sarcophyton elegans (I think a Yellow Fiji just not coloured up yet) a couple of weeks ago online. It arrived pale but in one piece. Unfortunately the foot of the coral has begun to disintegrate rapidly into white debris. The head seems okay, but the...

It’s been doing this for the last week or so. Can some one help me to figure out what’s happening? This is too extreme to be pedal laceration. It can’t be melting it’s not spewing guts or slime.