Not the same species but I handfeed my Asian bumblebee catfish and occasionally my gibby. That's wired he isn't going for barbs...Have you tried feeding during lights off? Bright light at all may stress him and because you have an all nocturnal catfish tank with no ants it wouldn't hurt to get dimmer lights or no lights at all.
Got an update guys! The fasting has finally ended. I caught 2 feeder barbs a while ago and tried hand feeding stimpy. At first he's hesitant, then as he swallowed one, it wasnt long till he downed another. He seemed to like the taste of these barbs. Good thing i had a bunch in a feeder tank gut loaded with hikari lionhead pellets. I released 10 more in the tank and the gulper ate 8 of em!! :thumbup:
