- ARKA GSC08US biological cleaner for aquarium substrate, with live bacteria that remove sludge, debris, and dirt - Natural and eco-friendly alternative to siphoning, no need for tubes or vacuums - Breaks down nitrate sources, phosphate deposits, and harmful gases in the substrate - Safe for fish, shrimp, and corals, suitable for marine and freshwater aquariums - Penetrates under decorations and rocks, working in hard-to-reach areas - Reduces invisible build-up, prevents cloudiness and bad odors - Maintains biological balance and water clarity in a sustainable way - Easy application: 20 ml per 100 L every 14 days in severe cases, monthly for maintenance - No need to turn off filters or vacuum, direct and quick application - Product developed by ARKA Biotechnologie, with decades of experience in aquatic care