My pond is infested with dragonfly nymph! help!!!?

You have a healthy pond if you have dragonfly nymphs. They will not harm your fish, in fact can provide a tasty meal for them. And no matter what, they will be gone in a day or two and you will have wonderful dragonflies. If they are mosquito larvae, they still will not harm your fish, but will make your life miserable when they hatch. If your water does not move, putting a small pump in your pond will keep the mosquito larvae out.