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Here's an interesting finding...
I had a mild bloom of ostreopsis a while back (sample identified by Pants) that for whatever reason subsided on its own. As an experiment, I placed some of the dino in a quarantine tank I had running and left it in the dark. Several months later I put a sample of quarantine tank water and silt under the microscope and found ostreopsis happily spinning about.
If you have an infestation of this species, lights out isn't going to work.
As I wrote before, all new additions to my tank get a quick dip in freshwater for a few seconds. My experiments show that dinos die instantly when exposed to freshwater. I can see the inflated and burst ostreopsis cells under the microscope after a few drops of freshwater in the petri dish.
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