maybe try some bio pellets... put some in a filter bag that is in a high flow area in your sump so you don't have to buy another reactor. Whenever I see some start in my tank I try and scrub it off outside of the tank, touch the stuff in the tank and it seems to spead even more.... I was reading an article online about nutrient eporting, this guy suggested getting some xenia as it grows fast and will export nutrients... I guess anything that grows fast might help...
water changes , keep the feeding to a minimum and just keep hacking away at it ..... the less drastic changes take the most time, so I guess it comes to how long you want to fight it.
I personally have wasted alot of time fighting hair algae over the years , I tend to lean towards nuking the rock , however that is me , you may want to try the less drastic approaches. I think it is easier to get coraline algae back than it is to get rid of hair algae.
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