You guys have to remember what type of payara's you guys are talking about too though. Scombs are ok, they are kind of skittish and very sensative to ich. They only grow to about 12 inches in an aquarium then mysteriously die off. Redtails, like Jeff Jollie has grow larger, are a lot hardier and a lot more outgoing. It's almost a night and day comparison. And the largest payara species is Armatus, which get to about 3 feet, are the most aggressive, and a lot harder to find (expensive when you do). So it really all depends on what you're looking for. I'd personally suggest a redtail if you plan on having tankmates. If you are planning on having a species tank, you could get away with 1 armatus. Good luck on your quest. Keep us posted.