I have always had parachromis species with pikes and I have never had an issue. They usually leave each other alone for the most part as long as the Pike knows it's place....Basically, as long as the Pikes in my tank don't challenge for the top spot, they usually are left alone......Well, except for my current pike, it hates flowerhorns for some reason, but eh, **** it, thats my girls fish....hahaha