fishypets: The tank is only about 10 months old, so the hair algae you saw was in the first 3 months of the tank being up, which is a very normal process (cycle) to go through when first putting up a tank. I did nothing to get rid of it other than skimming and letting the cycle do its job. As for the ozone, there isnââ"šÂ¬Ã¢"žÂ¢t a single piece of equipment I have bought that I have been happier with. Results are immediate! The very next day I saw the difference in water quality.