I stopped getting notifications for some reason. I don't know the salt dosage for Columnaris in teaspoons/tablespoons per gallon so you would have had to have looked it up anyway. I sounds like things are going reasonably well. I would mail order some trimethoprim sulfa just in case you need. If not, it's good to have around and remember that dry drugs don't really expire so you won't have to discard it in a few years.