Honestly, I would say no, that pike in the picture should not be in a 55 gallon tank. It looks like a Sp. Venezula, these pikes get 18 to 24 inches long. 55s are only 12 inches deep. Frontosa's also get larger then 12 inches over time.
This is on top of the difference in aggression. But usually the pike will not bully a tank mate, but believe, it will not back down and can do damage if provoked. Anyway, I would say no due to the species of pike pictured. You definitely will need to upgrade tanks with that big boy.