Help with microscope ID

[ChaseBurke]

Was battling amphidinium dinos for a while and these guys popped up. It forms on the sandbed in small thick mats that you can almost peel off the sand. I don’t think they are amphidinium because they are way smaller. This is at the third highest setting on my microscope. The one before I have to use immersion oil. Tested water and N03 was at 0.5 And p04 was at 0.10. Any help or ideas?

 

[ChaseBurke]

The amphidinium cleared up for about a month and a half. And this started 2 nights ago.

 

[ChaseBurke]

Bump

 

[Jason_1982]

Bump

very similar to my d
Latest find. Did you ever get an ID?

I had ostreopsis ovata...then large cell AMPHIDINIUM now this last one...see pic.

 

[ChaseBurke]

I never did get an ID. But I started dosing brightwell silica n03 and p04 and they went away in like 2 weeks.