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I just caught a message from Quiet Ivy I missed a few messages ago. You asked if what I had was dinoflagellates and not cyano. Yes it is very easy for me to distinguish dinoflagellates from any color of cyanobacteria (green, red, brown) since I have been looking at it and studying it (particularly cyano) for over 30 years. Dinoflagellates are hard to distinguish from brown slime algae when they first occur and the amount is very small (like on the tips of an SPS coral). Sometimes you just need to leave it alone and see what develops. Let it get a little bigger instead of constantly brushing it off with a toothbrush. I know because I was doing this. Finally I stopped and I saw why it kept coming back so fast - Dinoflagellates.
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