i always gut load feeders, but i generally avoid them. I got my knife on frozen food by getting frozen shrimp, thawing them out in sea salty water and wiggling it at the surface. He spit it out the first time but the next time he ate it, has been ever since. My knife was 5" when i got him with 2 polys and a fire eel, the only time he's aggressive is when he mistakes a poly tail for a feeder when he gets in hot pursuit mode. but other than poor daysight he lets the ornatipinnis rest on his back, for long periods of time too, always though that was cool.