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I had a severe dinoflagellate bloom a few years back. I lost almost every coral, some I'd kept for over a decade at the time. Water changes seemed to fuel new growth, 3-5 day blackouts had little effect. Removal via siphon provided temporary relief. Eventually I siphoned out all my sand along with the dinos and didn't bother to replace it. The bloom ended shortly thereafter. I can't attribute cause only correlation.
Prior to the bloom I'd not done a water change in years. I dosed nothing but Kalkwasser and coral growth was glorious. I have no idea what brought on the plague, there were no new animals nor did I change maintenance, salt or anything else.
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