Baby silver arowana not eating.......?

i just bought a 2 and a inch baby arowana yesterday and this guy is not eating at all...i bought him freeze dried bloodworms and freeze dried hikari brine shrimps..but doesn't seem to be interested at all...im so worry...i don't want him to starve...i have him in a 29 gallon with 3 small cory catfish and don't worry i have a 55 gallon and a 400 gallon for him when he grows up, only if i can get him to eat....