I have always loved the fish hobby. I have my koi pond which was completed August 2010. I also have a 300 gallon saltwater fish tank in my basement. The pond's dimensions are 16x10x5. I believe I am in the 4000-5000 gallon range. I have 2 uv's on the system with a bottom drain, skimmer, waterfall, and pressurized filter. I would like to upgrade my pressurized filter. I have about 15 8" koi to date...