Ok so like a week ago I got 3 big bala sharks prob 10" they were a lil beaten and one looked like he had some decent nose rub on him. I put them in my 500g tank and they have been really active not skittish and eating a ton. I noticed yesterday one was skittish and had a cloudy eye. Today, it looks like that eye is going to fall off (not pop eye) and all the eyes are cloudy on my bala sharks, and the chin rub looks horrible. My florida gar is fine and my RTCxTSN is ok, just isn't eating as much. I did a 20 water change yesterday and added salt today. Any idea what causes this? I know the water isn't perfect, but its not bad. I wish i could get pics, but they are way too fast and I only have my iPad atm. Any tips would help!