Okay, so we are moving. The good news is this means we can start building our "Final" pond for our pond fish! We currently have 3 koi, 1 shubunkin goldfish, and 1 ryukin goldfish(though I am trying to convince my parents to separate him to a smaller pond or tank, but they want to wait until we are officially moved in to the house)
So if we get the ryukin taken out, that's just 4 fish, three of which are koi and one is a goldfish.
How many gallons should we shoot for? And what filtration level, etc? We have plenty of space long and wide and can dig deep as well as add rocks and raise it slightly off the ground for more depth!