Brown Slime algae problem

[Greg]

hi all,

on my cup coral ive got what they call "brown slime" ??
ive read on a few sites that to combat this problem you can dose Vitamin C
to the system?? dose this sounnd right??
what causes this problem??? as ive never experience this before and the
coral is starting to loose a bit of flesh and im
a bit worried that the whole coral will die.

what can i do to help this coral before its too late?!?!?!?!?!?!?


thanks
Greg