I agree with lungfishlvr in a nicer way. Your first monsters, your oscars are still babies, 4 to 5 months is no time in fish keeping. I haven't even cleaned the majority of my filters in the time that you have been keeping monster fish. Everybody warns people about keeping large fish and providing a home for them, but is tough to get that message across. Until you actually grow a fish out to enormous size and realize what is involved with feeding it, maintaining these huge tanks, and possibly moving a huge fish from tank to tank you can't really comprehend the difference between a oscar and a guppy. Keeping fish should be a slow learning process, because of the wonderful wealth of information on this and other forums it is easy to think that you know what to expect and that you are well adepted to handle it. Just my two cents, I am really just trying to help you. Slow down a little and enjoy the fish you keep, spend some time away from the fish forums and just sit and watch your fish. Sometimes I will sit down to watch my fish eat and won't realize that an hour has passed. Enjoy the grace and beauty of what you have and not just keep looking toward whatever is next.