Sinking koi

[jimbo]

5500 gal pond, 5 years old, 25 koi from fry to 5 yr. old . Over the last few days, I have 2 koi that sink to the bottom when not swimming and turn on their side. When stimulated, they quickly swim normally until they rest again. They eat vigorously.
Scrapings of the belly showed no pathogens. pH , nitrates, ammonia , and phosphates are normal.
Pond temps vary between 58 and 65 over several days.
Any suggestions? Jimbo

 

[sissy]

Could be they are still resting .Are you still feeding them wheat germ or regular food .You can add a little garlic to there food to help them fight off diseases