Can 12 Chromis be introduced at the same time into a 190g?

[gobytron]

you may have a different experience in a nice, big tank.

But IME, Chromis are a great schooling fish in the wild, but become territorial and aggressive in a contained environment.

They will be just fine going in there together, but eventually, very likely that one will become dominant and kill off the rest.

Again, my experience has been in sub 100 gallon systems, so you may have a tank that is large enough to negate any issues.

Maybe some others with more experience with larger tanks can offer some first hand experience.