Hello out there, I'm hoping someone can offer some info. I have a very small man made pond/waterfall in my yard. It was the home of few small fish and frogs. Last fall I had some concrete work done at my house. The contractor used oil for something, I don't know maybe in the concrete sealer or forming. Anyway, my pond was coated with oil. All the fish and frogs have died. I've been skimming it and removed the oil off the top. What I have noticed is now the oil has not settled on the bottom. I didn't know this could happen. If we churn the water up, you can see the oil come up to the top. Is there anyway to clean this so fish can be put back into the water and live safely. Any info is greatly appreciated.