This is the nicest pond I have seen posted, landscaping is amazing. I like how you only have 3 Koi in 3000G, fish must be very happy with that much water. How deep is the pond? I'm building my 3 pond after moving and shutting down my 600G and 3000G ponds. I'm hoping I'v learned from building 2 ponds but I have a much smaller space this time. 700g if I'm lucky.