Heartburn? Haha, do you have to eat them or?. I can't imagine crunching on one of these guys. Personally, I only use them alongside springtails and lesser mealworm beetle larvae to clean up dead roaches, eat spilled food, and keep mold off new wood thrown into moist enclosures. They can breed more prolifically than some of the roaches I keep so I have another spare tub that I throw excess isopods into. Sowbugs do better in enclosures with at least a little ventilation, in my experience. The pillbugs especially like their fresh air. They always slowly die on me when I don't give them ample breathing holes. I use sowbugs as "canaries" in some of my enclosures that lack ventilation by seeing how well they do. I know I need to open up my sealed roach enclosures more often when they become lethargic and stop breeding.