Here's my Easy Carbon versus hair algae worthless test. I bought Easy Carbon to try and tackle some hair algae in various tanks. After pulling out strands of hair algae from my little indoor pond tank that I had dosed with Easy Carbon, I put the hair algae (with bits of xmas moss and subwassertang) into this little container with about 2 cups of water to try a test. I added one pump of Easy Carbon into the container and I took pictures on day 1, day 2, day3, day 5 and day 6; I forgot to take a picture on day 4. On day 3, I did a water change and put another full pump of Easy Carbon in.
I was hoping to see the hair algae melting away since this is a huge overdose (a pump into 2 cups of water as opposed to 10 gallons). The day 5 and 6 pictures do show the algae definitely turning brown so it is slowly working under this extreme test but it's slower than I'd hope. In my actual tanks, I haven't noticed any significant (or insignificant) changes with regards to the hair algae so I think I'll up my dosing and hope for the best, keeping my expectations low. If I hadn't already purchased Easy Carbon, I'd probably skip it for hair algae control.