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About a week ago I added ulva (sea lettuce) and chaeto to the refugium chamber in my sump. I was running a 9 watt IM chaetomax LED 24 hours a day and while the ulva has grown quickly, the chaeto turned white and just kind of disintegrated. Did I bleach it from too much light exposure? Or were there perhaps insufficient nutrients? My tank is a little over a month old and ammonia, nitrites, nitrates have been 0 since it finished cycling.