Hi, I have a betta that I keep in a 5 gallon tank with a water filter and a heater. He has a black bubble on his eye? I'm not sure exactly what it could be.
I just got done treating him for what I thought was fin rot and I put him back in his 5 gallon tank (He was in a 1 gallon with aquarium salt to treat the fin rot.) Before I put him back in, I did a thorough cleaning of all of the rocks, plants, and glass objects I have in his tank (Ran them under hot water - didn't use any soap) And I did a 100% water change so as to decrease the chance of any more bacterial growth. I floated him in the water in a smaller container to adjust him to the temp, and everything before I put him back in.
I'm not sure what this new bubble could be.. it doesn't look like any of the pictures of pop eye I've seen on the internet, it just looks like he's got a bump on his eye, and looks completely normal colored from the side, not filmy or white like most betta's eyes do when they have pop eye.
I also didn't want to put him back in the aquarium salt to treat it because I JUST had him in it, and I know its not good to keep them in it for too much time.
Has anyone ever heard of anything like this?
Front view, you can see his left eye is much bigger while you can't even notice the right eye from the front.
Top view, you can see the eye looks like it has a "bubble" on it.
Side view, his eye looks completely normal colored from the side.