The water change would not be responsible for this. Sounds like he may have some sort of an eye irritation.

As far as the diet goes loose the lettuce. I would add freeze dried or frozen krill or gamarus shrimp to the diet, fish, scallops, cocktail shrimp, earthworms and crickets. Diamond backs should have more of variety than just pellets. Also they may take some greens but try better stuff for him like chicory, dandelion greens or escarole. He may just nibble at it but generally they go for the protein first (especially juveniles).

I have eight adult diamond backs. All of them bask and will sleep under the lights with their heads out and resting on the ground. Several of them will even sleep on land if I don't wake them up to back into the water when I turn off their basking lights. All of them are in great shape.

As far as the eye it is hard to say for sure but it does sound like a irritation of some sort. (sand or something in the eye or perhaps he scratched it somewhere.) If the condition does not improve or even worsens or he stops eating I would get him right to a vet for an evalution.

Steve

[ Show Entire Thread ]