Hello everybody, I have read alot of your posts for a long time but never signed in. I have a 8,000 gal. Koi pond my son and I built with about 34 fish from 30" to fry and love it! I'm 52 and not great at the computer so bear with me.My pond is 18' round 3' above ground and 3' below ground.l've been doing pretty good but all advice is welcome.