I picked up some nightcrawlers today from the pet store. He didnt really show much interest so I mixed in two little fish. He gobbled those up right away and then I offered him a piece of worm. He ate it, but looked kinda upset that it wasnt a fish. He will go over to his dish and look at the other pieces, but doesnt seem to want to eat them.

is there a trick that i can use to get Dex to like the nightcrawlers?
what is the right way to 'scent' food items to peek his interest?