Fish food as with any food product will change over time which is why it should be used timely and not stored over 9-12 months. Ingredients purchased by the manufacturer can be variable which can lead to noticable color differences of different batches of food. The food formula or blending process can be tweeked occasionally to hopefully improve the final product. This summer I had a local pond owner store a newly opened bag of fish food in tightly sealed buckets. The food molded while the food in opened and unopened bags over the same time period did not develop mold. The fish food brand was Zeigler-Silver (40-10).
Last edited by Bill Cody; 11/30/16 12:18 PM.
