A unique mixture called RED X stops algae from growing in aquariums. Red X is extremely kind to aquarium occupants and safely removes unwanted algae in an organic and biological manner. RED X is completely safe to use and innocuous to fish, corals, and invertebrates when taken as directed. RED X works well against red and green cyanobacteria. mild infestation of dinoflagellates, including Symbiodinium, Amphidinium, Prorocentrum, Coolia, and Ostroopsis. Armor and gold algae Diatoms Dosage: For six days, add 10 ml per 100 liters (26 US gal) every day. After that, wait five more days for the full effects to manifest. DO NOT change the water during the treatment period. Avoid using any carbon, ozone, UV, adsorbers, or PO4 removers. After eleven