 What does it mean when a pet fish turns pale?
I take care of my teacher's fish at school. I don't know what breed/type they are, but do I know they are tropical. There's this one big silver one, Othello, he kind of looks like a pirannah. Othello looked normal Friday when I was feeding and cleaning the tank; however, when I went to feed them today, I noticed that he looked really pale. He wasn't all shiny like he normally is. I also noticed that he was keeping his mouth open a lot, too, and he hasn't been doing that recently. So can anyone help me out and let me know what's going on with Othello. Thank you so much! | 
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