I recently bought about 200lbs of rock, most of it had hair algae on it. I scrubbed off what I could get to, and put it in my tank. I know many people really attack phosphates to get rid of algae, but do remember that without it, coralline algae won't grow either (somebody correct me if I'm wrong). I do still have phosphates that are a little high, but I wanted a natural way of keeping hair algae under control. Hermits didn't seem to do anything for it at all, and I've spent probably $200 in hermits through a couple years. The Scarlet hermits were a failure also. they are so inactive it was pathetic. Turbos...well, they didn't seem interested in it as much as the film that grows on the glass. Top Crowns? They blazed a path right up my rocks, eating coralline and all on the way...making a pretty crappy looking tank. They were moved to the sump where they eventually died or got killed and eaten by emerald crabs. Astrea snails...I actually seem to keep them better than turbos. They don't really eat hair algae either though.
Within a few days after scrubbing the rock and putting it in, I got a Tennenti Tang, which is said to be a "voracious hair algae eater." One rock in particular, I could see some short hair algae on, and he did seem to wander the tank a bit and always come back to graze on it. He also gets along great with all my other fish. He's very active, and out in the open almost always. They aren't the most colorful of fish, but pictures on the net aren't as good as what he looks in person. He has a nice yellow srtipe along the bottom of his dorsal fin, and a blue stripe on the bottom fin that's like a neon blue. Like many fish, colors change with mood and their stress level. I also have read that they get much more color as they mature, but I'm not sure if the pics I have seen are of a mature fish, or not. Either way, I'm happy with this fish, and he's working for me.
