Possible? Of course, it's possible...
People sent to third-world prisons live out their lives in tiny, filthy, cramped cells...because it's possible. Chickens on factory farms live out their short, miserable lives in boxes...because it's possible. But...it's also cruel and inhumane.
What exactly have these cichlids done that deserves this harsh punishment?
We shouldn't be keeping fish in conditions that are merely "possible" for their survival. The goal should be to create near-ideal conditions. That can't be done in a 200-ish gallon tank for even one 20-inch active fish, let alone three.