also, if you take a syringe/dropper, and fill it with H202 (hydrogen peroxide), and apply directly to hair algae, it will turn it reddish in color and eventually it dies off. I don't have a hair algae problem in my tanks but occasionaly it starts to grow around the filter outlet. I take my dropper and apply H202 directly and it kills it off in a couple of days, plus the red hue on the algae looks neat!
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