It is more like 6 oscars, but 8 is fine too. I would say your tank is overstocked right now. One oscar and one pleco is max. And about your oscar being aggresive, some are very passive and some are very agressive, it probably won't get any better. If anything it will get worse. Get a different oscar or stick with what you got.
Oh and I heard eel's and oscars are not a good mix. FYI
Good Luck!
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