Volcanic planted aquarium substrate with chelated iron, 15 lb. bag Aqualine Buschke. Volcanit is a pH-neutral aquarium gravel of volcanic origin. The fine pore structure of the gravel encourages bacterial activity that enhances the biological release of nutrients from within the gravel. The results are superb plant growth. Volcanit is mixed with 5% ferrolit, a zeolite-bound long-term iron fertilizer. The black and red color of the Volcanit enhances the beauty of the aquarium plants and the color of your fish

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