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I have also experience something similar. 50 gallon breeder was running fine. Set up was 7 months old with rocks all from an established tank of 7 years. Was running both ai hydras and radion lights. I decided to buy 2 475nm blue led light bar to my current setup. Within a couple days my tank had a crazy dino bloom that wiped out a lot of my corals. Tried running UV, raising nutrients, and dosing bacteria but none of it seemed to work until I turned off my light bars. I then noticed a decrease in dinos to manageable levels. I highly suspect that it could be the blue spectrum that dinos thrive in.