<p>Crystal Clear turns cloudy murky water to "Crystal Clear" water right before your eyes! It is a cationic polymer that acts as a flocculent to clear cloudy water and keep your aquarium water looking its best&#046; </p><p>Crystal Clear can be used in both Freshwater and Marine aquariums and safe enough to be used in mini&#045;reef aquariums without hurting invertebrates&#046; It is safe for fish and live plants&#046; </p><ul><li>3&#047;4 ounce bottle (6pcs)</li></ul>