Collect a few minnows from a pond or lake and add them to the pond too. Small aquatic bugs are also an important component of the pond. Collect aquatic bugs at a local pond or lake by sweeping through vegetation at the edge of the water. Put the bugs in an old peanut butter jar and transport them to your class' pond. Add the bugs to your pond and watch the fish feed on the bugs.
Students love watching the food web at work.
Commercial flake fish food is a good alternative to their natural food. Continue to monitor your pond. As the school year progresses many interesting things will take place in the pond. Occasionally, you will need to add water to the pond. Purchase some chlorine remover from your local fish store.