I understand your pain on the hair algae when I had my small tank up and running I had a battle to keep it under control while it never killed any coral it did promote a lot of algae growth making the tank look ugly.
Hopefully things continue to go better for you also I found out from a friend that he keeps 3 electric blue hermits in his tank 2 of them eat the hair algae like there is no tomorrow while the third sifts the sandbed might be an option worth looking at.
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 My aquarium is nothing but a smorgasbord for my cats.....
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