I'd like to get something that would make my tank viewers go Whoa. Something like an oscar or a couple pacu. My tank is 12 by 18 by 48. Something like 45 gallons. Thus it's not so wide. Someone I new had an Oscar in a quite shallow wide long aquarium, would that be better, he's had it for awhile so it must be quite comfortable? I have tiger barbs and a bunch of other fish in there so no hurry, I'm just curious, I have a 30G tank I can keep them in if I ever decide 8).