What is this on my corals?

[Lalaallieu]

I had two fish die on me after a water change and then I came home to this after being gone last night. Can I just pick this off? The corals still look fine even though this green stuff is on there?

 

[Dragon52]

Looks like green hair algae & yes you can pick it off. If you use the search function it will give many stories how different people have dealt with it.

 

[X-37B]

Algae. Look up vibrant. Work well and is not a chemical.