What should I do

[macadac]

I'm getting red hair algae on my one coral
There was some red hair algae when I bought

There no hair algae anywhere else in my tank

 

[nmotz]

"Red algae" is likely cyanobacteria. Consider adding some macroalgae to the tank. It will suck up some extra nutrients and prevent the cyano from growing. Also consider shortening your lighting period by an hour or two as this could starve the cyano.

Otherwise, the stickies at the top of this forum have more great information on how to deal with cyano.

 

[CStrickland]

I've had good luck dipping new corals in diluted hydrogen peroxide when they had a little algae on them. Idk what kind of coral that is but if you google it there's a lot of info. I had some zoas that were really peeved about getting tickled by the algae fronds and a quick dip sorted them right out.

If you think it might be cyano that's diff. I can't tell from the pic if it's slimey or planty

 

[macadac]

Ok thank you

 

[aclinville]

Definitely macroalgae! but not in DT.