Identification: Dinos or.......

[dugthefish]

Been fighting ostreopsis for a couple months, have beaten it back. Now I have a few different but similar types of....alage... Identification help please?

First are some ostreo still hanging out in a coupe spots.

Second/third is some black slimy stuff.

Fourth/fifth is covering my back glass and powerheads.

 

[KJ]

Look like diatoms. @saltyfilmfolks

 

[Gareth elliott]

Agree, a colonial type of diatom.

 

[saltyfilmfolks]

Agreed. Or a light cyano. IMO diatoms seem to stay closer to thier mineral source, sand and rock.
If it’s a diatom on the glass and power head the sulicate may be coming in with the water.