One more note on tank buddies. If you have to get a P,don't stick a pleco in the tank. Pleco may be armored catfish, but agressive P species usually learn to tear their eyes out, then flip them over and eat them from the belly out. Oscars don't even last that long.
I'm with the rest of the thread. Try to talk him into something less dangerous. Predator fish are lots of fun, I keep a few myself, but there's plenty of them out there that swallow food whole, rather than tear it to shreds with a mouth full of tiny razor teeth.