I just got an Oscar a couple of days ago and I am new to the fish world. I have noticed that sometimes he goes on his side and just kind of floats there. Do you know what could be the cause of it? Also right now i have him in a ten gallon tank and he is around 2 to 2 and a half inches. I am planning on getting a bigger tank but do u know when i will have to get it (how fast they grow) and what size I should get?... I have read articles that say 75 to 100 gallon tanks are needed for only one oscar but is this true or are they just trying to make up by more then u need. Thanks in advance