I have decided to use a variation of the Skippy filter (simple design and cost were the main reasons). I do thank everyone for all their help and advise. I have one more question. Do I need to buy some bacteria or will it occur naturally? Seems to me that naturally is the way to go, but being new to ponds, I need all the help I can get. Can anybody give me some advise on keeping crows out of my pond and garden?
Thanks again.
Ken