Hi! Is it possible for a betta to have blindness in only one eye? I just got a new betta and he is in a 1.5 gallon tank; the water is from my other tank. He seemed heathy and energetic at the store, but now that I see him in the light he has one cloudy/scratched eye. He seems to be very happy because I've only had him for two days, and he made a huge bubble nest and swims around a lot, exploring his tank. I've read that this may be due to either blindness or an infection, but I don't think it could be an infection because his other eye is perfectly fine. What should I do if it is in fact an infection? And how could I tell if he is blind or not?