Course of protozin completed two days ago. Just finished a 30% water change and decided to add a half dose of melafix as a precaution. All fish seem to be ok and I see no signs of any disease (fingers and toes crossed). I will water change a couple more times this week and maybe continue with melafix alongside my observations. One fatality during protozin, a sterbai cory from a group of seven. Gutted about that as they were a really happy little group and had started to breed