Tetra algumin is a dual action treatment for algae in the aquariar can be used in aquaria containing fish and plants and is effective against green red and brown algaer contains natural peat extracts and the algicide monolinuron for the prevention and control of algaer the treatment works by darkening the water to inhibit algae growth and should be used both to treat algae issues and as a preventativer instructions for user shake well before user using the dosing cap provided add 5ml o