The big GATF is hard if not impossible to break them off live, I remembered my 6 inches GATF at that size its already paint in the butt to get it off live and took me roughly 2 months to get it first bite at market prawn and pellets, some GATF will just starve until it ran out of store engery then slowly die out. Even after I broke my GATF off live successful I still go back to feed him live (QT and gut loaded feeders) it's much more enjoy it go after a feeder than a dead meat or pellet but it's just me.