i know not sw fish but need help with koi

[kau_cinta_ku]

can anyone help me on this as i know this is a sw forum but i have 9 koi and lately 1 koi has been swimming funny. when he swims around he is like an acrobat doing twists and twrils all over the place and then goes back to the corner of the pond and just lays there until feeding time. we have had them for over 2 years and would hate to lose one. if there is anything i can do to help him i am all ears.
TIA

 

[Steven Pro]

Have you noticed any red streaks on that fish? Twisting and twirling can be signs of a water quality issue (including a contaminant) or bacterial infection. I would do a big water change regardless. If you see any red marks or streaks, do the water change and feed a food with added antibiotic.

 

[kau_cinta_ku]

kinda hard to see red streaks as his normal color is red, black and orange. all the other fish are doing great but none the less i will do a good size water change and go get some bacterial infection meds.

thanks for the help