the 2 oscars are only 3 inches, so im sure 40gal is fine for atleast 6 months. if necessary they will go in my 150 but my mom will buy him a bigger tank within 6 months, trust me. she bought me my 150gal tank when i was only 11 years old. the oscars haven't messed with him since i posted this. i guess they thought his tail was a worm. so they were pickin at it. they got to the stinger n realized it wasn't a worm. they dont pick on him anymore. but either way im splittin the 150 today, removin substrate on her side and puttin sand. she'll be all alone in that area with water chemistry of a 150gal tank so she'll be fine. after a few months or so ill remove the devider. thanks everyone.