My 4 inch oscar spits out his pellets about 60 perceent of the time and part of the time he does not even eat. he is with a 5 inch common pleco. but they get along fine. The tank is clean. he dosen't have hole in the head. hopefully he dosent get hole in the head like my oscar who died.I got him like a month a go. he is acting normal to. will it stop or if it does not is it a problem. or will it stop in a couple of days.