I was pondering to try and experiment to see if an airlift will work on the EKF trace using 4inch pipe.....
Would it draw enough water up into the pipe and flow back into the first barrel !.....
Loving that photo of the fish in your Profile, think I'll have a pond full of the Asagi types lovely looking fish.
Best plants to remove Nitrate
pug has a very impressive veg filter on his pond, have a look at some of his his youtube videos....