So yesterday my damsel's eye was looking a bit off, but couldn't really tell what was up, this morning it definitely has pop eye. I did a water change this morning cause. . .when it doubt change water. Checked nutrients, Nitrate at 5 and Phos at 0.025-0.05. My guess it the eye got injured as the damsel is protecting his eggs and will fight anybody. . . he has gotten into it with my coral banded before. Could an injury cause this? Also if I can't catch/isolate the fish is there anything to do besides give it good water quality?