Have been lurking and realized I am doing everything wrong. I always wanted a goldfish pond, when I went to a yard sale that had one for $10 I jumped on it. It is preformed I believe 300 gallons, hard to measure because it is kidney shaped. I filled it up with city water let sit for a week, dug up some cat tails threw in some duck weed. Then added 6 small goldfish, I thought the plants would filter the water for fish. After reading old posts here I ordered a pump and filter. The fish stay on the bottom not moving much, I believe it is because they are cold. Days here are not usual spring temperatures 50s low 60s should I buy a heater or wait for warm weather.Going to need a lot of help, everyone here seems nice and glad to help a newbie Thank you