So I have looked at various sites trying to find out what kind of Dino’s these are. Been trying to battle them for a few months now with no success. They don’t move on a pivot like ostreopsis but moved more like amphidinium. (Except they didn’t have a circle in the middle that I could see). Any help. Just got a crappy microscope so this is the best I could do. Thanks so much for any help. Also I have PO4 at .08 and NO3 at 1.3. I test often and don’t recall any period where I had bottomed out nutrients. Also I am running UV. They do go away mostly at night but not fully.