I have two wrasses (tricolor fairy wrasse and yellow coris wrasse) in a 10gal QT that arrived a week ago. My tricolor fairy wrasse had some white stringy poop while observing them (with no medication added to the QT at that point). I treated the tank with two rounds of API general cure given Monday and Wednesday (48hrs apart per the package directions). I noticed the same fish still having white stringy poop. What other medication should I give? I currently have prazi pro, melafix, and copper power.