I have Armageddons at the bottom of my 72 bowfront under 2x250w MH.
They had been doing fine, but I almost lost them recently after I started running carbon 24/7. Some of my zoas faded, and others closed up and shrank, as well as lost a lot of length on their skirts.
The various purple centered zoas faded the most. Some green skirted zoas faded to yellow green in the skirts. Other greens weren't affected.
Lost 2/3 of my Armageddons... the ones that made it had shrunken polyps and skirts. One type of pinks only got shorter skirts.
Everything is coming back though, now that I've yanked the carbon. I had massive chaeto in my fuge, and even that went down to 2 small clumps after running carbon 24/7 for a few weeks.