No offense meant Darth, but I'm with David, 16" oscars might as well be 16" unicorns, I have yet to see one that size in captivity. You stated that Oscars can & will get to be 16"+, yet with all of the millions of oscars out there in aquariums, no one has any actual proof of an O that size. Hmmmmm. But just for arguments sake, lets say that an O could reach 16" or better, that certainly wouldn't be the norm, anymore than a 15 or 16" midas. On average, oscars reach 12" in captivity, give or take an inch or two. So typical max size would fall into the 13-14" range. Not 16"+. Splitting hairs maybe, but all of this becomes relative when one is referring to water changes, the food consumed, and the amount of waste produced by these fish when kept in an aquarium.