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In this pic where I circled it actually took over and the piece of coral thats there receededIt can almost look like hair algae mixed in with cyano.
It is more than one thing. I see Dino, maybe hair algae and maybe cyno. It does not really matter what the name of the algae is. The solution is the same. Siphon it out. It is easy enough on sandbed. I would use a small diameter hose and siphon algae off of liverock, using a toothbrush as required. For stubborn algae on live rock, dip toothbrush in hydrogen peroxide every 60 seconds.
Around 6 months old. Nitrates and phosphates were both 0 causing the dino outbreakIt looks like multiple types and I also see some hydroids mixed in..
How new is the rock?
Looks like it may not have cycled or still going through a cycle.
zero nitrates and zero phosphate favor nuisance algae. Feed your tank to encourage coral and/or desirable macro.