12 grams is nothing I have 250 grams snakes having bowel movement bigger than that.
If you have not done so already downsize the tub to the very minimum, during the winter I keep male 800 grams and less in 15 quarts tub to ensure that they will eat throughout breeding season.
If you have done it already simply be patient.
I have had animals that were on F/T and started refusing after a while and once switch to live resume feeding however I do not recommend this unless you know how to feed live and are willing to take the risk of your BP not switching back.
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