I have been using Spectrum Ther-A Formula, (for small fish), for about 4 months, now. I have eleven aquariums in my home, in which I keep a wide variety of fish & invertebrates, and breed exotic snails, shrimp, platys, barbs, cichlids, & others. ALL of my livestock eagerly eat this food and thrive on it. I also grind it to a powder, and use it for fry. Perhaps the greatest advantage (for me) is having to keep only ONE type of food in the house, and use it for all of the livestock.