I've been grimly determined but I can't conquer it. My tank has a constant algae bloom. I've done big water changes, no water changes, a 3 day blackout, added only nitrates, added nothing, shortened photoperiod, etc. My tank is ugly and it's unfortunate, especially since all 3 of my tiger lotus are big and growing. I am out of ideas and I believe I have used every idea provided here short of buying a canister for filtration.