whats the best beginner butterfly fish to start with? any that are semi reef safe? ive tried 2 pearl scales and a racoon and all three lived exactly three weeks after a 30 day copper treatment and all died from uronema, could my tank just kill butterfly fish? have not had any other issues with the tank in a while now and all other fish are happy even a dispar anthias and chromis. are butterflys just really hard compared to other fish?