Check the listing for details. tourmaline balls. Condition: New. Listed at 8.00 USD. tourmaline balls. Tourmaline balls are mineral balls typically seen in shrimp tanks, but can be used in all kinds of tanks. Shrimp tanks, snail tanks, fish tanks…sky is the limit! The diameter of these balls are ~.4 inches. The package contains 20 balls each. Usage is 1 ball per gallon. The ball will slowly dissolve into the water column over time. Too many can increase the gh/hardness of your water…only use the recommended amount Shrimp, Crayfish, Snails, and goldfish can benefit from these calcium based ceramic balls. Not to mention it adds to the decor!
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