Brightwell Aquatics Florin pH- - Decreases pH in all Freshwater, Planted, and Marine Aquaria. * Safely decreases pH in freshwater community and planted aquaria. May also be used in marine aquaria. * Gradually decreases alkalinity ("carbonate hardness") of tap water and aquarium water. * Useful for decreasing pH of aquarium water when establishing acidic water conditions in biotope aquaria, simulating the onset of rainy seasons, or for encouraging spawning in fish species indigenous to low-pH environments. * Contains no phosphate-based buffers; will not contribute phosphate or nitrogen-based nutrients to aquarium water.