I am not very sure if I'm posting correctly but after of year of fighting green hair algae I have finally found the one product that truly works. This is in no way a promotion of a certain brand or vendor just telling you what worked for me and worked within three weeks. I tried the water changes, manual removal which is always necessary, I tried peroxide both as dosing and using 20% post directly while in the water and after removal of the rock that it was growing on but nothing worked. I even created a refugium using cheatomorpha, I'm a pharmacist and was told by a tank professional that fluconazole may work and I was able to find a product called reef flux which is fluconazole and by following the directions by reef flux I went from a continuing hair algae problem with no end to the issue. The outcome was this I used the reflux within three weeks there is not a sign of green hair algae! I have Xenia and also mushroom corals which were not affected at all by the fluconazole. It's a 120 gallon fish and soft coral tank. I'm not sure if other corals might be sensitive to this or not but mine had no ill effects. I will say the cheato in the refugium was killed off also along with the hair algae. I cannot stress enough if you have a green hair algae issue this is the product to use (fluconazole). Believe it or I manually removed as much hair algae as I could without actually removing the rocks from the tank then treated with the fluconazole product and within three weeks the tank is completely clear of all hair algae. The filters will become clogged with the remnants of the hair algae as it filters out and this is mentioned on the packaging as the stuff works that well so you will need to maintain your particulate filters during this process. I can't believe this isn't the go to on every Google search to kill off green hair algae it took me a year to discover this product. I hope this helps someone else.