I would suggest defrosting the f/t and then instead of using hot water to warm it up get a small saucer or little tub and apply heat from a hair dryer with the front of the tank open. My bp has learned to come out as its feeding time so long as I do it that way. She was a little hungry last feeding time and decided poking me in the ear would speed up her getting it. I figure this way works because the hairdryer spreads the smell around and possibly some of the vibrations get transmitted to the tank through the floor and suchlike.