sera goldy aquatan immediately conditions tap water according to the requirements of goldfish and their fancy variants such as Shubunkin, Fantail or Sarasa. It removes harmful substances such as chlorine and chloramines, binds heavy metals (e.g. copper, zinc or lead) and protects against ammonia. At the same time, it adds important mineral substances in a bioavailable form to the water, which is to the benefit of goldfish.