Hi I’m new to posting. And I have a 57 gallon deep blue rimless tank and a 29 gallon sump I am growing some Cheato. I started to help my father with his 240 gallon tank last year. So I’m some what new just started the 57 gallon in August I’ve been putting coral and a couple fish in at a time and in the last couple of weeks this Algae kind of looks like a feather started to grow. Whenever I did a water change I would try and manually take it off but I couldn’t ever get all of it. So if someone could help me identify it that would be great! Here are some pictures


