I built a 20000 gal pond. 7' deep, three BDs, two 4" gravity flow skimmers, five 3" mid-levels, twelve 1.5" TPR/GPRs. Vertical concrete block sides with 1.5" insulation inside and 1" outside. Insulated in ground filter room. Heated. The construction is posted on KS... not sure if I can post a link here??? Still have the exterior rock work to do this year.
Have 7 tosai in it now as it is new... Just picked them up at Koi America in the fall. Plan to hold 20 koi. Will take a couple years to gain experiance before we start building a quality collection.
Kathy's back has been bothering her lately so she will not be bent over any show tanks lifting fish... Well she is not allowed to anyway

. See you there.