Trust me, hair algae SUCKS. I fought with it for 5 months and I finally beat it. I tried everything under the sun and finally I manually removed almost all of it, and it hasn't returned in almost a month. I was looking around the tank yesterday and saw that any remaining hair algae is turning white and dieing.
I think the best tips would be patience (I was losing mine at some points), run some sort of phosphate remover, if possible set up a fuge with chaeto algae and a reverse light schedule on the fuge, use a good quality RO water, don't feed too much, and keep up with manual removal. I found manual removal to be important, if you let it get out of hand it is not only a PITA to remove, and derutis tends to collect in it which just adds to its growth.
Some people get lucky and the hair algae only last a few weeks, but some get stuck with it for several months. It all pays out in the end when its gone
29 gallon-planted community
20 long frag tank
75 gal-planted goldfish
75 gallon mixed reef with 20 gallon sump