Hi i got an oscar and a pikecichlid but im unsure what species the crenicichla is and if you have any advise getting it eating id be wery glad 

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And about the feeding...How long have you had it? Where did you get the pike from? LFS, Online, Friend?
Nice pick up! Add in some more rock work and driftwood, if your pike has hiding spots it should be less stressed and more inclined to eat. Ask the guy you got it from to see what he was feeding the pike. You haven't had the fish for too long so don't be alarmed if it hasn't eaten already. Good luck!