Not to sound rude or discredit what anyone has said, let's start off back at the basics since we don't know the actual issues. In all honesty with the glare and shadows, it's difficult to really identify anything in the pic. Another one with the tank light on and room dark would be better.
Op, it would be more helpful to follow this link so we can establish a timeline and base for what has led up to this.
http://www.aquariumadvice.com/forums/f17/before-posting-about-unhealthy-fish-read-this-32451.html
Sent from my iPhone that doesn't like me. Or you !!