Help! Hooking up pump filters and water feature

[sissy]

I have 2 and they are fussy fish and produce a lot of waste and my reason for 2 filters and an aerator .Plus the do not like really hotter water or sun .I provided shade for them

 

[Tula]

I adore my koi, so understand your desire to have them. If you can go deeper, that would be a big help, as they really need depth.

I used to keep koi, with comets and shubunkin. They were a prolific bunch