Hiya guys, i bought a small black oscar today and since i brought him home the troubles started... The second i put him in my tank he turned from black to grey/pinkish shade and (however it sounds) he looks quite sad... Hes swimming around and eating his food, but im not sure.. Its not that i dont want him or anything, but it would be cruel to keep him if hes unhappy.. Is changing color normal? Shall he be that color? My water is exactly the same temperature as in the tank in the shop... Does it matter what other fish im keeping?