Algae Indentification and Help Please

[ScubaGirl]

Yeah, did everything you just said but my pH wasn't quite that high to start.

Light was on for maybe 20 minutes while I cleaned up last night. I have the air running on one of my powerheads to keep the water oxygenated and I could hear that it was blocked. I had to go in to fix it. Skimmer was overflowing too.

Completing the rest of the "dark cycle" now. Tomorrow evening (Sat.) I'll do some more maintenance. That will make 3 days in the dark.