just got a new batch of 3-4" koi , and they are in a 75 gal.indoor aquarium
tank.
all water parameters are just 'ducky'
salt is at 1.7 , I am going to raise it up a notch or 2.

now. most of them are swimming along quite fine, but there are 3 of them
that are 'mostly' sitting/laying on the bottom they get up every now & then
to swim around..& they have grabbed some food ........ then sloowwwwly sink.
hmmmmm any ideas??

I looked up what I could find, and most relates to water stuff.. like
nitrites,, which is '0'

are they just getting over the shipping ( flown in from out of state).???