Red hair has always been in my tank, there is always a small spot on a rock here or behind the powerhead over there, but its nothing really. But when I slack off it comes quick and hard, only leaving when I get back to work. Adding a fish for algae control isn't a great idea, I would only recommend a sand sifter for such a job because they are actually cleaning up the sand. You should look into inverts instead, urchins plow through any algae, even corraline,black long spines are especially attractive.Lettuce sea slugs are another smarter option.