I have 3000 gallon pond with five 3-to-4" goldfish. I'm feeding them some standard store-bought mix, but never see them rise to the food when I toss it in. There are also some floating plants in the pond: can the fish be getting enough nutrition from the plant roots that dangle in the water that they don't need the store-bought stuff?
The fish are very energetic, chasing around the pond in a "herd".
The fish are very energetic, chasing around the pond in a "herd".