What algae is this and how do I get rid of it?

[austenreefer]

I only feed once a day, my lights are 2 ai primes that are on for 10 hours a day (I use the BRS settings) I do a water chance every other week, I use ro/di water I make with the aquatic life unit. It’s a 55 gallon tank and I’m not gonna lie, there are quite a few fish so that probably doesn’t help. I have like 10 fish. Most small other than a wrasse and a kole tang. My #1 priority is the health of the fish and coral so if something is gonna put them at risk I’d rather have the tank look bad. Thanks in advance!

 

[John Robbins]

What are your water parameters?
Nitrates Phosphates?
How old is the system?

 

[Nanoreefer4ever]

That hair alage, diatoms. Usually new tank with high nutrients level, or something might died off from the rock