Emerald Crabs are always a good choice for hair algae. They are usually fairly cheap and will munch on the algae. They will probably survive when its all gone, too. I personally don't think water quality is too much of an issue. Like a shaving brush plant, once it is established, it will do well. I used to get hair algae grow on top of my return water outlets where no one could reach it. It was always wet but in duel 250w direct hq lighting and water quality was excellent. Good luck.
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