Hm, I just got a Betta today (Ryu) and something about it's eye is bothering me. One eye (left) looks more sunken in than the other, but its right eye looks normal, not popeye-ish at all. So...
What size is your tank? 3 gallons
What temperature is your tank? 79-ish
Does your tank have a filter? yes
Does your tank have an air stone or other type of aeration? filter...
Is your tank heated? yes
What tank mates does your betta fish live with? none
What type of food do you feed your betta fish? pellets/frozen bloodworms/frozen mysies shrmp
How often do you feed your betta fish? daily skip one day (but so far I've fed 3 pellets and 1 bloodworm so Ryu has a good appetite)
How often do you perform a water change? I plan on 2 50% a week (cycled tank)
What percentage of the water do you change when you perform a water change? probably 50%
What type of additives do you add to the water when you perform a water change? aquasafe conditioner
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed? sunken in eye
How has your betta fish's behavior changed?
When did you start noticing the symptoms? when I bought him/her
Have you started treating your fish? If so, how? no
Does your fish have any history of being ill? no
How old is your fish (approximately)? not sure, he/she looks to be between 1.5 and 2 inches.
(BTW, not sure if Ryu is a girl or juvenile PK)
But yeah, it's sort of bothering me. Here are some (huge) photos.
Pic 1: If you look REALLY carefully you can sort of see it
Pic 2: bad eye
pic 3: good eye