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For a natural blackwater effect as in the tropics. Lively and healthy fish, shrimps and crayfish. Water according to the original biotopes supports coloration and natural behavior. Immediately binds heavy metals. No pH value alterations. Reduced algae growth due to reduced light. Long lasting water tint. Extremely economic. Sera blackwater aquatan with the Bio-Protect Formula conditions tap water to dark, clear, fish friendly freshwater just like in tropic waters.