We dont have a ton of money, but want a pond healthy for maybe 4 or so Koi. What is the minimum needed to accomplish that? I will tell you the minimum I know is necessary.\n\n1. At least 3 ft deep.\n2. A filter\n3. An aerator of some type...bubbler or fountain.\n4. Obviously liners, rocks...ect...\n\nOther then that, I read alot about skimmers and waterfalls. What can provide a good home now, and asthetics that can be added over time?