He should pull through if it's been this long. They are delicate but obvioulsy have survived a long time.
is absolute nonsense!You can't change more than 50% of the water all at once.
The fish has reacted to the chemicals in the water. thats y 1 died and 1 got a cloudy eye.
Try adding some salt, anti chlorine or black water the next time round.
Well...the Aro's eyes have cleared up and I used Prime after I topped off the water.