Looks like some sort of hair algae (Green or brown) from the picture. The easiest thing to do is pull the algae off by hand or with a tooth brush on hard to reach areas. Make sure your phosphates are under control and you may need to feed less to get the parameters back into order. You can also turn down the photo period on your lights. There are many different ways of trying to help this out. But Me personally I would try to get as much out manually as soon as you could.
It is also on a few other rocks on other side of tank as well... I am going to shorten amount of time lights are on also less feeding see if that helps with a new carbon pad
For the most part there is never a reason to start over.
Most all problems can be solved and this is what I do for R2R on a more biological end of things.
I can offer you my best solutions to help take the frustration away.
Agreed never start over we always need battle prep and yours is certain to respond it's easy variant.
It could have been much worse strain. Next time if it grows back also can lift out rock and pour on it externally the scrub off and you'll never have algae again, I sure haven't and it's been like six yrs now. We used to be simply disallowed from acting on it then rules got broken because someone didn't want to allow it any longer, one lost tank was enough to know their rules stink
If I did want to reaquadcape, would it be ok to take the rocks out pour peroxide on them and scrub? While leaving corals and fish in tank. Not in love my my current layout.
Yes that's ideal and you can do only one as a test to see
Don't have to do all at once even though we do in the big peroxide threads you can do it all at once
If you want to reset your algae by Monday using hand cleaning and peroxide we can link your pics to two huge threads. Dosing the tank is fine too, stuff isn't harmful. Simply adding to treatment modes. It doesn't hurt tank bacteria at all applied either way.