Hi

Just noticed yesterday as our Allard Clown fish did not come out for feeding and hiding under a rock. The Anemone he lives in has part of its body above rock and half under, so Allard was under rock with anemone. He poked his head out just slightly and I noticed his right eye was swollen and he seemed slightly disorientated. Do you have any idea what it could be?

Possibly some kind of water quality issue. Be a good plan to check for salinity, ammonia, nitrite, nitrate, and temperature.

If all that is in line, look at oxygenation, any signs of ill health in the tank such as excess algae, see if the clown has been attacked by another fish, any disease such as white spot.

Make sure your salinity checker is accurate, inacurate ones are very prevalent.