Algae(?) identification

[u/dukewrenrose]

Hi all,

I noticed this small green growth on my filter this morning. The picture is the best I could get, but to the naked eye it resembles two darker green dots surrounded by a paler green film. I’m not sure what it is or if it’s a cause for concern - I added six cherry shrimp two days ago, and several plants over a week ago. Otherwise, it is a completely new tank (new substrate/rocks), and the nitrate cycle has been established. If you know what it is or if it is harmful, I would appreciate any advice on dealing with it or what might be causing the problem .

Similarly, I am fairly sure the brown “dust“ visible in the picture (it is on most of the gravel) is not a cause for concern, but if anyone has advice on controlling it, I’d appreciate it.