I decided to use Thompson's water seal on the surround to my pond. I thought I was being careful, but saw an oily residue on the surface of pond water when finished. I used newspaper to try to get some of the chemical out of the water, I no longer see the oily residue, but have not added fish to the water. The water lily in the stock tank appears to be doing fine. Does anyone here know if the water sealer is toxic for fish and plants and/or what else I can do before adding fish to it?