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I believe I know why so many people have so many ways to get rid of hair algae. My reef is over thirty years old and for the first few years there was no hair algae. Then I started to get it in cycles for a few weeks at a time. Eventually, the cycles became longer until now I never am without it. My point is that for some reason it would disappear on it's own without doing anything and the tank would be free of it for many months.
I used to have an urchin collecting business here in New York where I would collect local purple urchins to ship to aquariums and hobbiests to control algae. The northern urchins would eat very fast in a tropical reef because they were not tropical animals. Each urchin would clean an area about an inch wide and about a foot long a night. When I had a dozen of them in the tank it looked like it was sandblasted. They would live about a year. Unfortunately my boat is away for the year and I am not collecting this year anymore. Hopefully next year I will get some.
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