Green Hairy Mushroom turning white

[SaltieG]

I have searched on this topic and cannot seem to find a good answer as to why a hairy mushroom, which greatly thrived in my tank, would all of a sudden begin to turn white and die? I got this mushroom from a frag swap a good 6 months ago and it grew to about twice its size, split into another shroom and now the original as expelled its guts, turned white and shrunk to almost nothing within the past month. The other mushroom which split off it originally is starting to do the same now. I can't figure it out. My parameters are fine, no changes in salinity or flow or lighting and what gets me is how they did so well and all of a sudden went downhill. Every other coral in the tank is doing fine and thriving, even all my other various mushrooms.

[scarpenter]

my rics have turned white an shrank. turns out i was filtering the water to well. Took out the charcoal and that changed things for me...hope this helps...