ive just bought a tank measuring 48" long, 18" wide, 27" high. i hope it would be fine for a single oscar, but would i be able to house 2 in there for life? i really want 2 different coloured oscars, but if it isnt big enough for 2, what other fish would be ok sharing this tank with a single oscar for life? i will be running a fluval fx5 on this tank.