HELP WITH REEF TANK!

[Reeferburns]

Hi, I was doing a water change a little bit ago and disturbed my gsp to attract in and when I saw the purple mat with all the tubes coming out half of the mat had green algae growing on the tubes and purple mat. Is this common or do I have a problem going on? I’ll leave a picture but it may be hard to see.

 

[GeoSquid]

The GSP looks healthy. It doesn't look like Green hair algae, but another kind growing in between it. I don't think I would worry about it.