TANGS WILL ABSOLUTELY NOT FIX A HAIR ALGAE PROBLEM-WHO TOLD YOU TANGS LIKE HAIR ALGAE? THATS CRAP!!!!
Hair algae is not eaten by tangs...very rare if it happens and if it does they will not eat much of it or even slow it down! Lawnmower blennies same thing..they pick but they do not slow it down...Sea Hare..if you get one that eats your problem is solved lololol but not really because it is a nutrient problem so it will grow back but if you have a good enough seahare he will bandaid the problem pretty good. Many of the sea hares DONT eat the hair algae though it is hit and miss! Best idea is to siphon out the hair algae on each water change use your thumb at end of hose to pull off rock etc.....put floss in overflow while you are doing this..then use a toothbrush and brush every single strand off the rock so the tank is full of hair algae in the water but none on the rock ...let the floss pick it up and use net in water column back and forth to pick it up....Basically GET ALL the hair algae out then remove the floss and then do that again a week later,,,again a week later and maybe one more time a week later..then END OF PROBLEM ITS GONE and if you change 5% water per week with RO water zero TDS and do not overfeed
your problem should be cured.. because as you removed the hair algae you were removing the phosphate that it consumed which is the food for the algae and the reason it grew to begin with..so you removed the algae food as you removed the algae...tHATS THE best way to get rid of it that will work if you have a bad enough hair algae problem really... After that reduce feeding and increase water changes and install a refugium if you dont already have one... Contact me if you try this and it is not working ...you are doing something wrong. Cheers, Good luck, Tim