Have a 9,500 gal. koi pong. Month and half old. 10 foot or longer Koi, probaly 30 babies, 2 sucker fish. No plants yet. Using 2 bio filters, one in a full size pool pump and filter. other in a 1000,gal an hour sub. pump. Get sun most of the day.
Algae out the ying yang. Cant see half an...