Ok, with the latest patch you reduced Nebulae waaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaay too much.
I have never adjusted nebulae and thought it was fine (if not a little scarce).
Literally I do not have a Nebulae within 100 hexes, and the closest nebulae with Elerium is over 150hexes away...
This is way too scarce for default settings.
Also looking at the image again, black holes see, a bit scarce as well.