My poor Frost seems to have developed a cloudiness over his right eye. He seems otherwise healthy, active and eats well and I think he can still see out of it (just). I had a quick Google and came up with several results like genetics, popeye and injury. I don't think it's popeye or an injury, unless he somehow hit it on the mostly smooth driftwood in his tank. Is this something I should be worried about? I've had him for about a year, he's in a 38L tank that has been running for 3 years with a heater, 2 sponge filters, live plants and some driftwood. His only tank mates are red cherry shrimp and some pest snails. I change 30-40% of the water once a week and use Seachem Prime. Here's some pics of his eyes: .