a 2.5 inch convict. i was moving my convicts out of my 29 gallon to make the 29 a salt water tank and while i was putting one of them in the 55 with the oscar the oscar took a liking to it. when i released it the oscar quickly swept it up. 
i can't figure out why my oscar wanted live food so bad that he would eat a convict but who knows. i feed him minows once a week. oh well. that's one less convict i have to worry about. as a side not my male convict has hit 3.5 inches and is still growing pretty fast. he seems happy in the 75 gallon.