I recently lost my albino oscar who lived in a 75g and I loved having an oscar but since i still live with my parents ( Im 15) they made me get rid of the 75g. A couple of days ago my friend who has a 20g long tank and he stupidly bought a 9 inch oscar off of craigslist and stuffed him in there. So i made him give me it because the poor thing could barely turn around. I had an empty 40g that was cycled with water from my convict and senegal bichirs water about a week ago that he is currently in. So my question is if i grew the longear up could it live with the oscar happily in the 40 gallon for at least 6 months or until i can work up the funds to get another 75 gallon for the oscar. I have been looking at another sunfish after my bluegill died in February and would really appreciate any advice you could give me. I have access to a 7 inch bluegill that someone is looking to get rid of if that would work better.