My tank is being taken over by a long thread algae. It’s all over everything the filter stands the glass the Driftwood plants everywhere mainly the Driftwood. I take out as much as I can with my hands then do a 50% water change and three days later it’s growing back like a weed. I checked the ammonia levels and they are zero, and nitrate levels barely register. Nothing is different in the tank and the light levels have not been changed in 2 years. The tank is nowhere near being overstocked. And feeding has been the same for the last two years as well. How can I stop this from happening and get rid of this garbage. It takes over the tank literally in about a week to a week and a half. Help!