I noticed about a week ago one of my royals has a missing Gil flap. I suspect the rocky substrate may have caused this. I am about to change it to bare bottom. Today I found him at the top of the glass against the bubble wall and rapid breathing. Could this be internal parasites? As I have lost plecos that exhibited this symptom. I previously dosed this tank with Parsi pro wih him in there. Any other ideas or things I should do?