Over the past week I have noticed that my flame angel, who was recently added, has lost some of its color and its fins have become torn up. There are no other fish in the tank. It seemed fine when I put it in but its condition has quickly deteriorated. Not sure if this is a bacterial infection or something else. I am thinking about pulling him out into QT but am unsure of what to medicate or if I should medicate at all. Anything helps.