Seachem Acid Regulator is a non-toxic formula designed to adjust the pH levels within your tank to an acidic range between 4.5-6.8. Additionally, the mix will soften the water by precipitating calcium and magnesium found in the water. Safe for the inhabitants of your tank, Seachem Acid Regulator helps to create the optimal environment for acid acclimated species such as neon tetras, silver dollars and tiger barbs. Suitable for freshwater environments.