Dymax Algae Brusher 150mlThe Algae Brusher helps to prevent accumulation of adhesive algae and phytoplankton by dissolving organic matter to promote a healthier environment for fishes and plants. Algae Brusher being a preventive solution, could also effectively diminish algae like brush algae, beard algae, thread algae, brown algae, red algae, slime and even sludge. It is harmless to use with aquatic plant if use as directed.