maybe a touch off topic, but...
the best looking piece i had at the time in my tank was an elongata that grew like crazy, perfectly purple (ish), anyways....was my fav. thing in the tank.
i use tm pro reef, 12 percent wc/week, iodine once/week, etc. (full params later if you really want).
ANYWAYS...i got a tiger cowrie to help with a tiny hair algae bloom i was going through, and about the 3rd night after getting it, my xenia started to look like crap. on the 4th night, middle of the night, i wake up and look in my tank to find...that damn cowrie EATING the xenia! it was totally wiped out. i read somewhere that xenia MUST HAVE mh or else it loses its natural defense, etc. (i dont believe this, though). maybe what happened to me, but i use pc with almost 6watt/gallon...
im just ranting now, sorry....
anyways, im STILL super bummed about it.