Black Algae what kind could it be?

[BelLoe08]

Hello, I’ve been noticing
those black algaes on my reef tank glass for a while. They look very disgusting, so I wanted to find out what kind it is to know how to remove them, does anyone know which kind it is? It seems poisonous for invertebrates cause my starfish died after it ate those algaes, my other invertebrates have been dying too since those algaes appeared.

 

[blaxsun]

Possibly dark cyano (per this thread):

Black Algae?

No idea what this stuff is. One of my Mexican turbo snails ate some of it but don't think they like it. Does anything eat it?

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