My internal CO2 reactor has been putting out a nice fine mist of bubbles in my 55 gallon, then I have another power-head at the opposite end of the tank to keep a slow race track flow trying to disperse the bubbles.

I now have a Drop Checker with 4dkh solution, showing a nice green.

As you may know I had a bad outbreak of Black Algae, still have some Sword plants that have the more stubborn black stuff on the edges of the leaves.
The CO2 bubbles have been sticking to some of these areas on the leaves. I have been able to just scrape the black algae off, which appears to have died.
This is only in the areas where the bubbles have been sticking.

This leaves me with a question, Is the CO2 mist killing the Algae or could the algae have already been dead and the bubbles just happen to be there.

I'm doing some more experimenting with this one.