I've treated with JPC without any problems to holding moms or fry, but if you use something stronger than that such as Clout, I think there could be more potential for long term damage to developing fry.
I never had any negative effects from JPC. No distress in any fish, not even the ones I was specifically treating. You might want to do an immediate water change and reconsider your approach. I also immediately boost my aerator if fish seem distressed in their breathing . . .
you might have misunderstood me, they were distressed prior, I think it's working a little bit...........I also added almost a cup of epsom salt, Kim said it would help as a laxitive, so now we wait :roll: