Hi there your looking at our Mineral Balls that balance the PH of the tank water and help vitalize metabolism and strengthens the immune system of shrimp/bettas/snails and the rest of your amazing fish and tank mates.The Mineral Balls Contain more than 30 minerals magnesium,aluminum, iron boron....
The Mineral Ball can decorate aquariums,make your aquarium more colorful. 
We sale these in 3 sizes
Simply add 1 small one per 5ltrs and the large can do 20ltrs, can last upto a couple years.
Warm Note:Wash clean before put in your aquarium.
Thanks for looking and don't forget to check out our shrimp kits and Botanical sets,great value for money.