Looks like and is little air bubbles with green for underneath it's everywhere in the tank and won't go away even when I shut the light down. I have plenty of phosphate reduction along with refusion
No it's not a bubble algae that was my first thought but the bubbles are not hard there literally air and once you touch them they float to the surface and pop
I do have a lawnmower in the tank along with a powder blue or yellow tang and a clown tang that all eat at the rocks but they are not touching the stuff