In my 10 gallon qt I have a medium flame angel and a mistake clown. Since the flames are extra sensitive to copper I am dosimg slowly and gradually to get up to about .4 of copper. I only added ten drops 24 hours ago and am not going to add the other ten until tomorrow but he is already showing signs of stress. Is this normal? I really don't want to lose my flame. I woke up and he was lethargically swimming and when he went by the hob filter he kind of stuck to the intake until I distracted him. Help!