sera mineral salt for the increasing of water hardness in osmose water, pouring, and soft water. The essential minerals are often insufficiently present in the confined aquarium environment. Fish take up a part of these important substances not with their food but directly through the water. Dangerous deficiencies occur whether the original water is already low in minerals (in particular R/O water) or if a dense or especially demanding animal stock in the aquarium (the plants, invertebrates and micro organisms also consume) consumes the required resources, if essential substances are missing. The excellently water soluble sera mineral salt directedly provides all important trace elements as well as valuable calcium, magnesium and potassium in pure form without any polluting additives.Sera Mineral Salt+ improves fertility+ strengthens the immune system+ for flawless scales and a strong skeletonDosage sera Mineral Salt: normal dosage: 5 g for 100 l of aquarium water. Tip: Due to its KH n