gu2high
Aquarium Advice Freak
I have this brown algae problem on the rock and plant. Ottos do not touch it. The tank is old. So it is not diatom. Is this a red algae? But the color is like iron rust to me, brownish, not red at all. Or a cyanobacteria? Need id it. Thanks!
here is the picture,
here is the picture,