Thanks for all the quick responses. Looks like I've got a Flowerhorn and Dempsey added to the mix. The guy also gave me a couple golden severums, a couple geos, and some giant danios. So far no real problems adding them all in with my aro, mayan, silver dollars, and banded leporinus. Except for the one geo that disappeared, presumably a victim of the 2ft arowana. Definitely a little overstocked in the 220 at this point, but the guy couldn't take them with him, so I figured they'd be better off with me in the 220 than getting dropped off at the fish store. I'm actually seeing a lot more movement in the tank and less territorial aggression with the additional fish. The flowerhorn is feisty but not really bullying anyone so far. Maybe when he gets as big as the full grown mayan it'll start reeking some havoc, but they have plenty of hiding places. So far so good.