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Looks like dinos to me.
Have you tried filtering you water through a filter sock into a white bucket, then placing it in direct sunlight? (Or under a direct light source if its cold where you live)
Dinos cannot be filtered out with a sock, they'll start to "reconnect" and form a slime within a few hours of being under a direct light source.
That may be an easy experiment to confirm what you are dealing with.

thats awesome. Seen similar on the net. Have you done cyano?
How very very cool.No I haven't but I do have a photo of diatom. Diatoms are present in just about everyones reef. It's only when conditions (usually silicates) are right that we physically see them. I am a biological tech for a state agency that monitors marine life. We track Red Tides (Karenia brevis) and Golden algae and other killers. I have a little bit of cyano in a low flow spot. I will try to get a pic and post it with the diatom.