My dad had koi ponds in his back yard and fell in love with them. He did everything he could to get me to put one in my back yard. Right before he pasted away he claimed I promise to him that I would put one in. His pond were about 1200 gallons, mine is 15,000 gallons. Our pond is 25 across (basically round) and the deepest part is 9 feet. We have a water fall and a 40 foot creek that runs into the pond. We put water in it and let it go. I have a bio-filter 8500 GPH, and a skimmer 2000 GPH. This spring drained the pond and added 2 ponds, 3 creeks and 3 waterfalls (3800 Gallons). I had to clean the big pond getting the alge and dirt off the bottom. When I completed the extra ponds we filled it up with water . After a period of 2 weeks it was getting a green color in the water, So I drained it and refilled it again. 2 weeks went by again and it is turning green. I put some water plants in it, about 40 various kinds. Will this clear up the pond or do I have to do anything else to the pond. I did add another 8500 GPH bio-filter for the new ponds and creeks. The big pond has alot of circulation and flow, close to 20,000 GPH. Please let me know of any suggestions. When I ge the green out I will post some pics. It really looks nice in the backyard.