I have a 11' x 2' x 2' pond with no filter, waterfall, or pump. There are about 20+ feeder goldfish in it now and the temp here is around 50 f. How would I put power near the pond so I can put a filter of somekind? Could I put a bunch of plants in so that the fish would have a better chance of survival? How would I add terrestial plants in there reason being its much cheaper? Any low cost low tech ideas for aesthetics or so the fishies won't die?