Very cool! My experience in pikes is really limited but I have to say my own tapajos I is quickly becoming a favorite. Bold and not afraid to surface, recognizes me as a food source and begs incessantly when ever I look in his direction. Yet is peaceful enough that right now he's comm'd with Tetragonopterus Argenteus, Electric Blue Acara's, Papyrocanus Afer and Ptychromis Tarantsy with no issue at all thus far(knock on wood).
Mine started out feeding on small pieces of shrimp stuffed with pellets and has now moved on to eating pellets straight. Can I ask what's your guy eating right now? And how big was he sold to you as?