I am new to Garden ponds and I am starting my planning stage. I have been in the Saltwater aquarium hobby for 15+ years and I have always wanted a garden pond /Koi pond. I have a old tree stump/mound in my backyard that I want to hide. I will be creating a waterfall feature on top of the stump, and will be using the mound to my advantage for the water to run down and into the pool area. I am thinking the over all gallons will be around 1800-2300 gallons. Any suggestions or advice would be greatly appreciated.