Ah..they will scare him at first..try finger feeding ..you'll be fine seriously.....my dwarf took about 13 days to get to feed here......
even try teasing him with food and then drop it above him to sink down past his mouth...try it a couple of times and if he shows no interest, simply remove it and try in a few days.....
Remember these bigger guys and morays being like this when I imported them for a couple of weeks, then there was no stopping, or feeding, them,lol....