Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Manual first. Very soft toothbrush, tweezers (fine).
Some CUC members are better at removing algae from corals than others. I've had good luck with Astrea snails for that but there can't be too much algae in the tank or they get overwhelmed or maybe overfed.
The usual nutrient recommendations (low nutrients will weaken the algae allowing for easier removal/management).
More aggressive:
H2O2 wash. Since you can remove and hold the frag/rock, I might also try H2O2 on a brush/swab. Use 3% and dilute it further by 10:1 to start. Apply carefully to algae. Rinse off before putting back in tank.
Most aggressive:
Also some corals can be dipped without too much risk (although there's always some risk). There's a schedule on here from Justin Credabel I've used. Posted link from my build thread