I have a 1000 gallon pond and started it 7 years ago with 6 39cent goldfish from Walmart. It is my first and only pond.. I didn't know anything about ponds. The first year I ordered pond plants and they multiplied to the point that the entire top of the pond was covered, at the end of the summer I removed them all and had quite the surprise that there were lots of babies, long story short I now have about 60 fish in the pond ranging from 5 inches to about 9 inches. One of the 5 inchers, we call Flipper has some unusual habits unlike any of the others. He sleeps on his side in the winter at the bottom of the pond and in the summer he would swim with his head above the water, then graduated to leaping a bit and now he completely jumps out of the water and dives back in. Is this unusual? I have only lost 3 fish since I began this pond.