Dinoflagellates can be pretty brutal IMO. I fought with them for a year before I finally figured it out. I tried everything and my "cure" was removing my sandbed which was basically a nutrient sink and powerwashing the rock. I have no idea what causes it but the cure for it could be on this list:
reduce photoperiod
increase alkalinity
increase pH
add refugium
increase skimming
feed less
increased waterchanges (frequency and volume)
Good luck!
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