Hello. I have a new problem algae in a couple of my tanks. It is a green/grey woolly algae edging some of the leaves in the tank. It doesn’t come off without damaging the plants. Does anyone know what it might be and the best way to remove it? I am already doing water changes every other day in one tank with it and every 4 days with the other. I am not currently adding liquid fertiliser and my lights are on 7 hours during the brightest part of the day. Unfortunately some natural light gets to the tanks which are both heavily planted.