Can anybody identify 5hese dots ?

[Tyler777]

My angels tank started showing Black dots everywhere. I tried to clean em up with a magnet cleaner with no luck, I tried a scraper but nothing the only thing that worked was using my fingernail scratching it.
Anybody knows what it is ?

I have 2 pics of them it's not on the plants it's on the glass

 

[WhistlingBadger]

Probably black brush algae?

 

[Colin_T]

need pictures where the dots are in focus.

 

[MaloK]

When I zoom all the way on one spot in the picture it looks green.

Maybe green spot algae ? Depending on Light intensity and nutrients it takes, In can be darker in color than the typical bright green, It can also become populated with other living forms that will make it look darker.

You will need a razor blade scraper to effectively clean that up.

I have it in one of my tank and left alone it will completely obstruct the glass with time, It's a good algae, as long as it's not too favored by your environment it will never become a problem.

When I scrape it with a razor blade I leave the "rolls" it makes on the bottom, and the shrimps eat everything in a snap, they love it.