We got some bags of vigoro decorative Creek rock from home depot to put on the liner of our pond which did not have complete coverage. We have 8 bags of it and we were on our 3rd bag when I thought I should ask this question because every time we've done something there is some weird repercussion that we could never have imagined that would somehow harm our fish. Please tell me there is no negative effects from adding Creek rocks on the liner after triple washing them at home with a garden hose. I'm sure there might be a negligible amount of chlorine from the garden hose but we are at this time adding water with dechlorinator as well.