I come from the world of halides and T5s. I don't remember a lot of dino outbreaks. I fired up my 50 gallon after a few years of moth balls, thinking all that stringy stuff must of been a fluke. I chunked on a 40 gallon sump, got my protein skimmer working, started the cycle. I switched on my reefbreeder( led light) it worked. The ATO, check. The heater, check. After a month and a half I noticed the leds were in default mode (low light). Added some purple and red Coraline algae goop and turned up the light. I went to Florida for over a week. (grabbed a quart of gulf water for the bacteria). Came home and growing on the sand and rock was my old friend red to purple strands. I wanted to see if my friend would burn itself out. I added the gulf water and sand and covered for 3 days. The strands turned brown and thinned out, but not gone. And after a couple of weeks with the lights back on the dinos are flourishing. This whole time my sump under ambient light doesn't have any signs of dinos. The systems is empty as far as corals and fish. So the plan is, a few days of darkness, a snail cleanup crew, and keeping my leds romantic for a few weeks. My question: Is it possible that the led lights are responsible for dinoflagellate out breaks?

