I have a 120 Gallon with an Anglefish, Leapord Ctenopoma, Parrot fish, Peacock eel, Vampire Pleco, Gold Nugget Pleco, and a couple lg bristlenose plecos. Would an Oscar be to aggressive? or okay?
Depends on the Oscar's temperament, you might get lucky and get a placid one and everything will be fine or you could end up with just an Oscar and lots of dead fish if you get a mean one!