Im not saying that its a waste im just saying that there are other things better than an Oscar you can put in a 125 in my opinion. I do like how involved you are with the forums so I respect you as a hobbyist and hope no more arguments between us wont happen again. Good luck to you and your fishyoure right my comment was disrespectful. im honestly annoyed by you and i shouldve left the goldfish comment out of the topic. but i said it.
but by you saying that providing an oscar with a large tank is a waste is mind set that i find pretty annoying. no large volume of water that can be provided for any fish that we keep is a waste. oscar or tetra.
but on topic, long term.. i think an oscar should be kept in a 6' tank.