Vibrant health: Just like vitamins, minerals and pH balanced water for humans, your Shrimp, Bettas, Crayfish and Snails also need those things for bright colors, healthy breeding, molting and play! So, when you add DDSG Mineral Balls to your tank you’re giving your fishy friends, the best of health! How do they work? Out in the wild, cherry shrimp, ghost shrimp, amano shrimp, freshwater fish and all other water-lovin’ life are constantly exposed to pH balanced, mineral water from earth’s rocks – with natural bacteria. This is how they molt, breed and maintain healthy vibrancy. Our organic tourmaline is a natural rock with over 30 minerals to keep your tank balanced just like those wild waters. Size and quantity: This is the most cost effective pack you’ve found on your search. Chances are you have at least one 10 gallon fish tank (but commonly 20 gallon tank, or 50 gallon). And because you’ll add one ¼ inch ball per gallon, you’ll need enough for every tank! So this 100 pack makes perfect sense.