alright. i see your sarcasm

and I reply with absolutely none.
I had an Oscar in a 55. I'm telling you, it just made me uncomfortable looking at him swim. Once he was 10", it just bothered me to look at him in what was becoming and ever increasing coffin.
My Oscar now, (not the same one) is 13" and in a 125. I can honestly say I can't imagine ever putting him in a 55. Probably the smallest tank I would feel comfortable placing him in would be 80.
I used to be like "whatever, its just a fish, he doesn't know any better whether its a 55 or a 125" I'm sure that's still true, he may be too stupid to know the difference...
but I try to imagine what it would be like to be a fish that big swimming 4 feet, then having to turn on a dime and swim back 4 feet.
Then add having to share the space with any other fish and it just seems too miserable.
So I wont consider you a monster if you did it. But that's the perspective from someone who did it thinking "whatever" and then regretting it.