Black beard algae: ten ways to fight it

Black beard algae (BBA) is one of the toughest algae to shift. It clings to leaves and hardscape and comes back if you only treat the symptom. The fix is usually a mix: less light, stable CO₂, lower nutrients, manual removal, and sometimes spot treatment with liquid carbon.

We’ve put together ten approaches that keepers use — from the basics (light, nutrients, flow) to the more targeted (spot dosing, blackout). No single trick works for everyone; the guide walks through the options so you can pick what fits your tank.