I've only had the fish in my pond for about 5 days, and this morning all 6 were gone. No trace of them, and nothing that looks like a predator got to them. I'm assuming it was some kind of bird. But all 6? What can I do to prevent this in the future??? I'm not getting new fish until I figure something out. My backyard is surrounded by a 6 foot privacy fence, and I'm in the middle of a large subdivision. I've never seen a racoon in my neighborhood, and the fish that I had pretty much swam to the bottom anytime I came near the pond. Help!!!