I got some dubia roaches about a year ago and have been waiting for them to breed ever since. They're all fully grown and I have males & females. I've seen people say that their roaches bred at room temp, but mine haven't. I got a Zoo Med Reptitherm U.T.H. under tank heater, (I have the same one for my crestie) and I don't know how I should place it for my dubias. Their substrate is a coco fiber dirt. They have egg cartons for hides and they get regular feedings of fruit & veggies and water crystals just to make sure they stay hydrated. Honestly, they're kind of like pets at this point because I think they're super cute, but I want to stick to my main intention of feeding the smaller roaches to my crestie. They're in an old glass 10gal tank so I'm not worried about the heat melting anything obviously, but I just don't know if I should put their heat mat under one side, or on the side of the tank. Which would promote faster breeding/is safer for them?