First of all, I'm brand new at raising Oscars. Three weeks ago, I bought one oscar (about one and a half inches). He would lay at the bottom of the tank in the far corner. A couple of days later, I bought another one (also about one and a half inches). The new one was very energetic, and swim around the tank like there was no tomorrow. Then the first one died. After I took him out, my second then took over that corner the first one used to lay in. He, too, stared laying in that corner at the bottom when previously he would swim around very happily! Two weeks past, and last night I bought another one (about two and a half inches). As soon as I put the new Oscar in, the old one swam to him and followed him around like an annoying sibling. The new one could barely turn around without the other one right there. He was by no means fighting or even trying to frighten the other one. It was almost as if he were excited to have another. After a while, he went back into his corner, and every once in a while, he'll come out. What could be the matter with him? Why does he stay in that corner? I thought he was lonely, but he still retreats to that one corner. Even though he does come out sometimes, which itself is an improvement. Any thoughts as to what's wrong with him?