1 ball for 2 gallon of water. Put Mineral Balls directly inside the tank or filter. The minerals will be released slowly for 2 years. The mineral life balls can also be used hen the nutrients of the aqua soil decay losing or GH is low. 100% shrimp safe! Contents: Mineral Life Balls consist a lot of essential minerals including potassium, sodium, calcium, magnesium, silicon, phosphorus, titanium, manganese etc.