What happens to ponds with goldfish when it rains {actual questions inside}?

My husband and I have a pond in our back yard that has gold fish and turtles. We do check the ph every week to make sure everything is ok but if you go to pet stores they should have on hand (or they can order them) goldfish that can survive in outdoor ponds. We started out with what they refer to as pond goldfish. They are larger than your average goldfish and those little guys are tough. Make sure when you go to buy them though that you take a good look at them for fin, tail, and scale damage which could be a sign of parasites. Depending on the size of your pond Koi are a great fish to use too. Rain water of all things will not kill pond fish. They are ment to be outside. There is not enough acid in the rain to make a huge impact on the fish. You will have to treat the pond weekly seeing that it is a small water m. Adding a waterfall to your pond also helps filter and add oxygen to your pond for healthy fish. But don't worry about the water quality too much if you get the right fish they are able to live in not so perfect conditions.