For the past week I’ve been battling hair algae in my aquarium. The tank is a 10 gallon divided for 2 bettas and has been running algae free for 7-8 months now. But suddenly I have hair algae everywhere, in my hairgrass, in the wood, and worst of all, in the moss. At first I tried manual removal and I cut back on ferts and lighting, yet two days later it had all grown back. Then I tried removal by trimming the plants covered in it, still didn't work. I tried the blackout method for 3 days and upon uncovering the tank I discovered the invasion was worse than usual. I’m fighting it blindly right now and some insight would be greatly appriciated!