Awesome pond! I like the waterfall and the rocks in the pond. I hope someday to have a nice pond when I get a house with a yard. (condo right now)
Maybe swap out the koi for mbuna then having the rocks will be okay?
Not a fan of koi myself, I live in Hawaii and I get tired of mostly seeing koi in ponds all over, maybe I should start seeding them with cichlids hehehe...but I like your pond a lot.
EPC #329 - VPC #59
20L - P. axelrodi, C. macracanthus, H. ocellifer, T. albonubes "gold", Stiphodon sp. gobies, Sailfin mollies
16BF - T. albonubes "gold", A. dolichopterus, Ps. gertrudae "Aru II"