Turning off the lights for a couple days does help. Or even just reducing the light to a couple hours a day until you see progress. Are you using tap water? The hair algae is there due to excess nutrients, usually found in tap water or heavy bio load.. Use of RO water helps alot. As far as cuc, Astraea Snails are phenomenal HA eaters. Also hermits or emerald crabs will cut and eat it..