Someone I knew had a school of Asian arrowanas but they kept jumping out whenever one of his kids would forget to close the door on the canopy.
If you keep them well-fed, I would imagine that you could start off with a small school in a tank that size if all are introduced at the same time. Of course, if that doesn't work you'd have to sell them off pretty quick, so that's the risk.
Arrowanas on top, with assorted stingrays on the bottom I think would be a cool looking tank.
BTW, can you even get Vampire tetras in Canada? Never seen them around here before. Those would be a show-stopper.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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