So I have been treating my 2 clowns for intestinal parasites, both had/have white stringy poop. The larger female is looking good and healthy but the smaller male wasn't always eating but would eat every other day so I thought he was getting better. But then this morning I spotted him in the corner of my tank and he had a white spot on his side, when I got home today about an hour ago, he had already passed. Can anyone advise me on what could have happened and what I might need to do to prevent this.