These tiny plankton-like freshwater crustaceans grow to about 3 millimeters in length or less. The Magna daphnia are the Red Russian type and a bit larger than other species.  They swim almost vertically in their tank. They live quite happily in large groups within a tank, so that you can harvest them when you need them to feed your fish, tadpoles, salamanders, newts, or aquatic insects.  They reproduce quickly.  It only takes eight days for a baby Daphnia to grow to maturity and begin breeding. Each Daphnia has ten babies. If you have 100 Daphnia today, you’ll have 1000 Daphnia in a week. A week after that, you’ll have 10,000 Daphnia. And so on! In a month, you could go from 100 Daphnia to 100,000 Daphnia. Their life cycle is only a couple of months.
 
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