By The Pragmatic Aquarist on August 8, 2018.
There is no algae that causes me more grief than black beard algae aka BBA. I've researched and read many opinions on what causes BBA, but I've yet to find a clear answer. In fact, the answers are often conflicting citing variables like flow, nutrients, lights, CO2 i.e. basically everything common to a planted tank setup.
My own experience with BBA shows that:
I've had success with hydrogen peroxide particularly when I use it for spot treatments. I have two methods for spot treating. Regardless of the approach I use about 1 ml of hydrogen peroxide per 2 gallons of water in a given session. Even with this though, the BBA eventually comes back. Presumably because there is some in the aquarium somewhere and it eventually spreads.
At the moment I'm able to limit the BBA growth with hydrogen peroxide, but if things get worse I may consider these other approaches:
Check out these related articles: