I hadn't thought of using 3, that's kind of interesting. For now, i'll probably just do the 2 to save a couple bucks as I'm sure I'll want to add things as I get this up and running. But adding a 3rd down the road shouldn't be a problem. And yes the tank does have a center brace btw.
Lights are ordered and will be here in a week, protein skimmer here by the weekend as well as the heaters. So shouldn't be too long now till I can get this thing wet finally. Starting to get impatient