One of my 3 black moors is probly 7-8 yrs old and had one eye pop in a water siphon. The other fish cleaned it up and it healed nicely, but his remaining eye has gone flat. One of has eyes that are mis-shapen and bulging. no discoloration/oddities other than the shape/ size. One has perfect eyes. The two latter are about 2 years old. Besides the 3 adult black moors, i have one plectossomus in the tank with them. It's a 29 gallon tank. I haven't been able to find out anything helpful about the common eye problems in this type of fish. Other than the eyes, they all seem very healthy.