I'm looking for some tips and tricks to more effectively find secret rooms in Enter the Gungeon. The rules don't seem as straightforward as Binding of Isaac, which has similar gameplay/mechanics. I once found a Map item which showed all rooms on the floor, including 2 secret rooms. However, I've so far not been able to figure out their placement logic.
I do know that you need to use a blank to break open walls to secret rooms. But blanks on each floor are limited. Can enemies accidentally reveal secret rooms like in Isaac?
How can I most efficiently find secret rooms, given the ammo limitation? I don't want to just randomly shoot walls in every single room, seeing as the starter guns (with infinite ammo) will not reveal them. Or am I wrong in assuming that there is more internal logic to it?