Posted on behalf/request of Devan
Notes by Devan:
You cannot see the waterfall here, I actually disconnected the pump through the waterfall as it had a small leak which I am sorting out .
3 other pumps , one for my filter (4000L) with UV light and bio media
2 other pumps to get the water moving (kind of a venturi).
I put in a temporary tarpaulin for sun protection and also have 2 air stones for greater aeration.
The koi are quite happy as you can see and now come up close to the edge when it is feeding time.
The small ones that I have added are growing well and the biggest one is now just a tad under 42 cm