I have this greenish algae coating on my rocks. It stays short and it's quite pretty. It bubbles more than actual plants (see pic) and provides oxygen for my fish. The bubbles are extremely fine and light so they dissolve better I guess.
Whole rock bubbling with a spot with constant stream of fine bubbles.
I wonder if it can be a good water quality indicator

Whole rock bubbling with a spot with constant stream of fine bubbles.
I wonder if it can be a good water quality indicator