What type of alegae is this?

[Brettyd]

What type of alegae is this?

And what option do I have non-chemically and chemically?

Pros and cons of each too


Note fake coral.

 

[Brettyd]

Picture

Here is the pictures of the culprit

 

[coralbandit]

Looks like common diatoms.
Theywill go away by them selves in time,no need to treat.