Hey how is it going! I upgraded my fish tank from a 20 to 75! Anyways, I have 4 bala sharks and 2 rainbow sharks in the 75. I know I'm a bad person for keeping them in the 20 for a month and a half :/ but I had just bought the rainbow sharks a week ago and have a question. I really want to get an Oscar well can I? The bala sharks are only about 2 inches each and want to add a tiger Oscar. Is it possible if the Oscar is tiny? Should I return the rainbow sharks if I get the Oscar? Will a tiger Oscar eat the rainbows?