Ugh, being on a site like this, I see all of these fancy fancy setups and acronyms and stuff like that, and I want it all, but baby steps I guess????

I probably will end up doing a rack set up, it seems like the most convenient, and although I don't plan on keeping the two males that I have, I will most likely acquire others in the future.
I'm not really sure how to set up a rack though, like I know that you use tubs, and of course a rack, but what should I use as a heating element to heat all three enclosures?
What is the best way to incorporate this into the three tubs?

I can do the rack fairly quickly, I just need to know the best way to make it the most efficient.

There are quite a few people from TN around here.