Not exactly the most sought after fw fish, but your everyday feeder goldfish will take care of it. I had an Asian Leaf fish for a while and it only ate small feeders. One day it just died. A few feeders survived and they ate every bit of hair algae in my tank in a couple of days-to the point where it never came back. By far the best substrate cleaners I've seen. If you don't like them in your tank, you could simply give them back to your lfs when the algae's gone. You just have to watch that the don't get a taste for your more delicate plants.
Shaun.
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