Microscope identification

[Aquaman6410]

My 75 is now over a year old and still suffering from brown uglies. My acans I added to the tank are super happy but brown hair took over a hammer coral as a tester and the polyps bailed out. Other corals tested in tank seem to not be happy with whatever is happening but again, acans seem super fluffy. I'm thinking I'm still suffering from Amphidinium dinos after trying so many things (adding bacteria, blackouts, dosing nitrates/phosphates, dosing silica for diatoms, manual removal, UV sterilizer). I have some coralline in the tank but not near enough to really out compete a lot of nuisance things. The tank was 100% dry rock started. I grabbed a clump of the brown hair like algae on the rocks/sand and put under a microscope. Here is what I see. Still looks like dinos but there appear to be very very few diatoms and something that looks like triangles. Not sure what I'm seeing here. Also, really can't seem to beat this over a year later. Contemplating put a rock from my healthy tank over but know it has bristleworms and asterina hitchhikers. Let me know what you think this shows.

 

[Dan_P]

Prorocentrum dinoflagellate. I assume pictures with small cells are just lower magnification.

 

[Aquaman6410]

Yes, the smaller pictures were lower magnification to give different views

 

[taricha]

yep, what Dan said. Also you are right about the triangles being diatoms.

 

[Aquaman6410]

Is the method for getting rid of prorocentrum any different than other dinos? Should I add the uv sterilizer back in the display tank? Should I keep dosing silicates to boost diatoms? This exploded after I used chemiclean to get rid of a bad cyano outbreak. I should have just left it!