What Algae is this?? It's all over the Rocks and Woods like Dust and small cotton thread. As well as the same algae is forming a thin layer of dust on Plant leaves. But this is not at all stubborn. If I rub fingure it's coming out easily and If I put ant plants under tap water the algae is getting washed out like Deep green water. What is this? How to get rid of it? This is nither BGA nor Hair Algae. Tank is running with 3WPG MH light and EI dosing with pressurised CO2 fixed at 170BPM speed.