Beat back my ostreopsis thanks to this thread with UV, increasing nutrients, and increasing biodiversity. They did not return with increased skimming or my first two water changes. However, I did notice a very small population of Amphidinum on two of my rocks. I'm in the process of raising my tanks temperature to see if that works. I'll report back on the outcome and add an extra data point if it's successful. Will be sampling daily to see how the population fairs.