Microbe Lift Mini Pellets are a high quality fish food, specifically formulated for fish 4" and smaller. It provides a balanced diet for your fish that contains stabilized vitamin C for proper tissue development for your fish. When you purchase a high quality fish food, you will find that there will be less undigested waste in your water. Fish will eat inexpensive, low quality fish food, but cannot digest it very well. Fish will deposit more undigested food, adding to the decaying organic matter in your pond.