i guess i need to speak up,few things bothering me.
first let me say my wife is the one on here asking some questions(not getting much for answers) as i have turned a 150 gallon tank over to her(i said sell it or salt water)
anyway,I am big into koi,decided i should speak up.
first welcome to koi ponding but
rocks have no place in a true koi pond(boy will this create heated debates).
plants are kind of iffy also for true koi(they will more then likely destroy them)
should have a skimmer(maybe missed in picture)
BUT what REALLY bothers me with your pics.the pump looks like an energy hog pool pump.good pumps cost more but will save in long run.
BUT WORSE THAT BOTHERS ME IS THE FILTER
the ultima filter well the size of it is a model 2,000 but the valve on top is one that should be on a 20,000 size filter.will not effect performance with pipe size and such but is very misleading on the max. 125 gpm.a 2,000 size filter should be only max. 34 gallons a minute.
so your pump and filter do not match at all plus pond size looks a lot less then 5,000 gallons.
People need to know exact gallonage of a pond and that LxWxD does not work at all.if you ever need to medicate the pond say your pond is only 3,000 gallons and you dose for 5,000 depending on medication you could kill all the fish.
so decided i did not want to be the one that sits back and says nothing.now hopefully a few others will help my wife.