he should still just be getting used to it i think its especially hard for larger fish because my 10 inch jd took a week to even try anything. he might just be eating a little bit if hes spitting it out. he might just also be picky. my cichlids will eat a lot of different foods but the thing they really go insane for is cichlid sticks. my jds wont even come out during feeding unless its live feeders or cichlid sticks lol