When I bought a pair of albino oscars, they did well together, after a year I found the one of them is becoming thin. One day the other stronger one was bullying the thin one. So I separated them, but I noticed that the thinner one is unable to look at the food given in the tank. It seems it became blind. But it with lot of effort eating well. What would be the problem, please give the remedy for it. Actually this one is a veil tail oscar.