I need some health advice. Our show is in 5 days. Winter has moved in pretty fast and my water temp dropped from 23 degrees to 18 degrees (celsius)in about a week. I detected a small fungus on one of my sanke and called out our koi vet. We dipped the koi and she took some scrapes from a few fish and found some bacterial activity in the mucus. She advised I raise the salt level. So I raised the salt to 0.4% from 0.1% in a day. Today I noticed a mild case of pop -eye (exopthalmia) on a few of the fish, it's worst on the tosai. Is this due to me raising the salt to quickly? I've stopped feeding. THe water parameters:
PH: 7.5
NH3: 0.01
NO2: 0.00
NO3: 18ppm
Will this correct it's self or is there anything else I can do at this stage
