Nice! I haven't seen those around in a long time. I had a pair a few years back and as long as they couldn't see each other it was all good but the second the male caught sight of the female, it was on. The male was at least 12" and the female was a measly 6" but every year, starting in late Oct, early Nov she'd take on a brilliant red color in the soft part of her dorsal. This would last until about March and then she'd be a brown log again. Beyond that however there was never any breeding activity. The female eventually jumped out of the tank while being chased by the male.
Even at 12" the male really had no interest in other tankmates as long as they didn't fit in his mouth. He really wasn't aggressive per se, but he certainly didn't take any crap either.
I eventually had them eating most any frozen food but they seemed to especially like krill. Overall they were one of the easiest to keep pikes I've ever had.