I'm a newbie to AP. I have had my system up and running for 2 weeks now. It is roughly a 400 gal pond with 3 grow beds. I have an 800 gph pump and using red cinders as my grow medium. I have 6 juvenile koi, 3 gold fish, and 1 prawn. The pH level has been between 6.5-7.0 The fish seem to be doing ok.
I have been trying to read as much as I can on the subject, but there doesn't seem to be much out there that doesn't cost too much $$$ so I rely on others experiences and hope I am lucky not to run into too many problems.