No i havent found the killer lol by the looks of it the dying has stopped, or slowed down dramatically. I ended up loosing all my octospawn, all my prized colored hammers (just have a few heads of purple tip hammer left) and i have 2 heads of basic frogspawn (go figure my least favorite coral in the tank AND it was a freebie from cornbred lol) and my 3 head cornbred hell fire torch survived, which currently has 2 heads splitting. I have no idea what happened or caused the mass die off of my euphyllia. Its almost like my tank went thru a cycle when i changed lighting. After i went to led i got a huge algae outbreak and cyano everywhere, the tank was 100% algae free for 2 years before the light upgrade. Is it the actual cause, i have no idea. But thru all this my zoas were growing like crazy and my sps (even tho most of them were engulfed in cyano) are growing like crazy, especially my birdsnest, it has easily doubled in size over the past 2 weeks.