Xenia - Overnight Turned White - Someone said it will Nuke the Tank? Is this True?

The tank has been up for about 3 Years and the Xenia Grows very fast.



Yesterday as usual before I did my Weekly Water Change I tested my Tank.



Ammonia 0

Nitrite 0

Nitrate 0



Everything perfect as usual.



Did the Water Change.



On my Way to work I looked at the Tank today the Xenia was White as a Ghost (I have never in my Life seen Xenia in any color but Lavender).



I told my Friend and he said it happened to him before and the Tank was completely Nuked and all the Corals Died.



He said his Xenia turned white and then the next day it was oozing stuff out and everything in the Tank Died and he had to start over.



I have never heard this before but if that is true then I have like One day before I loose my Tank.



What do I do?



He said Xenia is very toxic and that if I try to take it out that it could release toxins in the water.



Has this happened to anybody before?



If so what did you do?



It did not Shrivel up or anything and is Waving Around Like Normal but went from Lavender to Pale White Overnight.



All other Corals in the Tank look great too (So Far).



I am panicking.