so, i came in from work and my bass was belly up. he was the first bass i ever caught on a fly rod and by far the most colorful largemouth i have ever seen. i had him a year and i loved that fish. so now, i have an empty 55 gallon tank in my apartment with a filter big enough to clean the water for a bass equavilent to a large oscar.... and i saw a tiger oscar at a store that was awesome.... so my biggest question is, how big does an oscar have to be to eat live food, and is my tank big enough for 2? how do you tell the difference between male and female?