those are pretty big i must say. i suggest you leave them alone, no transportation anywhere, 3 sides of the tank covered, ideal conditions ( temps/humidity), just change of water daily, nothing else for at least few days. they have to be pretty hungry to go for something they don't know, but there is also chance they'll never go for nightcrawler if they've never been fed on it, just keep offering different food items, be patient, they have tons of fat, will be fine for a while