Thanks everyone! I really like him so far. He's really active, and he likes to hang out in one of the driftwood "caves" in the tank. He's gone after a couple of guppies pretty aggressively, which I see as a good sign.
What's the best kind of foods for these guys? I'm using frozen bloodworms, brineshrimp and beefheart, plus live blackworms, and pellets (small community pellet for now, but will hopefully be getting some bigger stuff for him).
Are ghost shrimp a good treat occasionally?