I'd go with pike cichlids and peacock bass. peanut power is gonna love that answer. my second favorite predator is my ctenopoma. his hunting strategy is amazing. He flips to a verical position and levitates over his prey looking like a dead leaf. He then slowly lurches forwards then lunges quickly. he's the balls.
and whats the coolest part about them is when they have to they CAN feed on GREAT WHITES