New Ponder ?'s

Hi, new here and new to the world of ponds, don't have weeks to peruse
archives, so please forgive dumb questions?
The new pond is rubber-lined, about 6' deep in the middle, 30' by 40'
oval shaped, guessing about 20K gallons? Fed by spring water, (spring
box makes about 800 gallons a day), new water is added about every half
hour-40 minutes and exits into a drain on the other side, so it's kinda
natch'rl, ya know. Has a recirculating pump drawing from near the
surface and flowing over a two tier waterfall, so some air bubbles
always going.
Put about 20 feeder goldfish in about a week ago; they were looking
pretty happy, so added 5 (4-6") koi a few days ago. They seem very
happy, but little goldfish are gone, so I figure they became lunch.
Question is this: Does this set-up sound like it might be OK? I
tested the water and it seems to be within spec, and I have had
aquariums for years, just not a pond. Will this pond undergo the whole
"break-in cycle" since it is constantly changing water? Is the number
of Koi good to accomplish "break-in" if so?
Any comments, suggestions, etc?
Thanks in advance for any responses!
Mike

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