How to get rid of red algae

[Reefer Rob]

Is it cyanobacteria or red algae?

If it's cyano and your tank is new just chill, it should eventually go away on it's own. It is naturally occurring in all tanks and blooms when there is a change (good or bad) it can take advantage of. Stability is the key to a clean tank, it should disappear when you tank balances out.

Red algae requires a more aggressive approach.