>>I am just getting a small colony of Dubia roaches and was hoping to get some advise on the best way to heat them. I have heat bulbs keeping it 75-85 degrees, is that sufficient? Is there an optimal environment for them to thrive in? I have read up on them but if anyone has actual experience that would be wonderful. thanks in advance for your help.
Those temperatures are fine. You won't have any problems breeding at those temperature. Heck, I keep mine between 70-80 and they still breed but slower than "typical". Do realize when temperatures are stated, there are two types of temperatures that can exist in a roach colony (ambient and local). Ambient being the temperature you are stating and the local temperature being the temperature the colony is producing, since ummm... roaches produce heat as a byproduct.