Daphnia is a highly nutritious live food that can be fed to tropical fish. Daphnia is small freshwater crustaceans that can be found in lakes, streams, and ponds all over the world. Due to their high protein content, they are a great fish food source. Our discus, especially the young fry (between 1/4 and 3 inches in size), receive a lot of daphnias.
Daphnia is an excellent source of nutrition for small fishes, so it should come as no surprise. For eons, numerous species all over the world have heavily relied on this abundant resource. For roughly the same amount of time, as people have been keeping fish, fish keepers have been touting the advantages of feeding live daphnia. Daphnia, especially Moina, are particularly useful for growing out juvenile fish because they typically contain approximately 50% protein by dry weight.
 Benefits
 1. Gives your pet fish the nourishment they need
2. Rich in vitamins and minerals.
 The fish that are most likely to feed on Daphnia
 Betta fish, Tadpoles, salamanders, newts, aquatic insects, and many types of small fish.
How to feed your pet?
Not more than 1.8 grams of Daphnia a day
Caution
 Do not overfeed your fish.