Well I can't measure the water params rite now, but I do no tht the pond has been set up for abt 6 months, and I already have one shubunkin and ten mosquito fish ( started off with 2). It is in an open space, and I live in southern California. It is under partial shade. I haven't lost any fish so far, but I have seen some cats prowling around my house. I always scare them off when I c them though. The koi is still about 3 inches long, so I have it in my quarantine pond, which is about 40 gallons. Will transfer it to my 1000 gallon if all seems well. I'll get bak to u guys once I test my water.