I have two Plasma Cannons that both do DoTs over a span of 15 seconds. Someone in my fleet told me that DoTs like that don't stack. I tried looking for myself and I didn't see any information, and it's hard to tell in game what damage is being done or not. Does anyone know for sure? I have a second cannon that would be better to use if indeed the damage isn't stacking. Also, I can't tell if two or 3 cannons is better since they share some kind of cooldown. If any smart people want to educate me I would greatly appreciate it.