At 250 grams the animal should not go of feed and should be a voracious feeder.
If you have not done so downsize (15 quarts tub max or 10 gallons tank) , if it already is in a 10 gallons tank go with a tub.
If the animal still do not resume feeding after a week in their new environment FEED WHAT WORKS (what YOU want is irrelevant). There is absolutely no reason why a healthy animal that is growing has not ate since November just because the food source is 45 min away or because you do not want to feed live.
If you don't feed a young growing animal that is voracious it's gonna become a viscous circle the less you will feed the less it will want to eat, it's not about what YOU want to feed it's about what the animal wants to eat.
If they both will eat live that's what they should be on for now until they are ready to be switch, obviously F/T is not working at this point.