Algae identification? Take action or leave be?

[Drew1900]

I’ve watched this patch of algae over the past week or so slowly start spreading. It seamed to originate from the trunk of this Blasto. Looks slimy, green and has a few small bubbles. My snails and crabs don’t seam to touch it. Should I continue to observe and see if it takes care of itself or go ahead and scrub/ siphon it off?

Nitrates 10ppm
Phosphate .04ppm (I did recently have a dip down to .02 for about a week)

 

[TriggerFinger]

It looks like a bit of cyano. Can smother coral. Keep it off your coral

 

[ThePurple12]

Might as well siphon it out, but doesn't look like something to worry about.