I bought a house that had a koi swamp. Ok, just a swamp.... We cleaned it out and got it running... I wound up purchasing a bunch of koi and a filter system from someone who was closing down the pond. We had that running for a bit, then one day, I saw a heron poaching my fish. The pond was only 2.5' deep at its deepest point. I tried fake heron's, a motion sprinkler, but the bird kept coming back, so I chose to make the pond bigger and deeper... A lot deeper. Filled it up... Redid the plumbing and added UV. Ordered some rocks... That's how it sits now. Just waiting for this stupid weather to stabilize a bit. The plan is to build a couple waterfall features on the ledge that we discovered while digging it out. The coping edge will get smaller rock and plants to soften it up. C'MON SPRING!!!!