Highly doubtful that a Xingu 1 and Zebrina will coexist long term. You can try. If you wan't to increase your chances, there has to be enough high flow that the pikes are constantly swimming against a current for most of the waking day. You also need about as many as 3-4 times the amount of hides for each pike. But, lots of bad things can happen when lights have turned off. If I remember correctly, Vin Kutty (way more of a pike expert than me since he's studied and observed pikes in the wild) had stated that Xingu 1 were more nocturnal in nature.