If for any reason you have trouble hatching fish eggs with methyl blue, acri flavin is a very good alternative. In one of our hatcheries, we use this almost exclusively because the results are better in our water. Add 20 Grams to one pint of water to make Stock Solution. Use between 2-5 drops of this stock solution per gallon of aquarium water for treatment.
The Med - Acri flavin Neutral Powder (egg hatching aid) is a customer favorite, and we hope you like it just as much.