cup coral shedding?

[bv_reefer]

hi i just got a nice healthy green cup coral, lps, and today i came home to see him shedding some white slimy stuff, i've heard that this is a very common
occurance in toadstool, but never read about cup corals experiencing this? it's coming from underneath him from his stem, not from the actual top, which is somewhat of a relief but it's starting to worry me, as it comes back every couple hours...anyone?