red eyes

Im new here so this is probably the wrong place to post, but im so worried! I have two sturgeons in a pond, they have been there for a month or so, doing fine sturgeon things. But today i noticed one has bloodshot eyes, sticking out a bit. He is acting normally though. Feeding hasnt changed or...

Our tank was doing well until we did a water change with out a water purifier our fishes scales started to fade, but when we put water purifier in the all got better except for one his eyes turned red and he just lays at the bottom of the tank he's defenitely alive we just don't know what's...