Hello, one of my Pajama Cardinal has a cloudy and swollen eye with pale colors. It came with 2 other pajama cardinals that I purchased at the same day and at the same location a couple of days ago. It came paler than the others but the swollen and cloudy eye started to develop after. No other fish in the tank show any signs of problem. It still eats although not nearly as energetic as the other cardinals. Any idea on what it is and how I deal with it?