JBL Tropol converts aquarium water into tropical blackwater. Creates water conditions like those in the tropics due to peat extracts. Bonds heavy metals. Prevents growth of algae by filtering out light components that promote algae. Iodine complex prevents iodine deficiencies & works against ulcers caused by iodine deficiencies. Reduces stress & prevents fish illnesses. Natural chelators make plant nutrients available. Anwendung Bei der Pflege von Schwarzwasserfischen wie z.B. Salmer Welse Zwergbuntbarsche Diskus u.a.