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

[Trigger Man]

Ok guys, as the header says, I just bought 12 lg chromis to go into my 190g. They will go into qt first, then to the main tank. The DT has been up since mid November, had a velvet issue, so was fallow of fish until Mid March. It currently has a Scribbled Angelfish and an Achilles in it. (I took out the sail fin and Pakistani Butterfly to lessen stress on the Achilles). Once the 12 Chromis are ready, can they all go into the DT at the same time, or do you guys think that could add too much stress to the Achilles or the tank's bio load. The Achilles is 3.5 inches and is shy compared to my old one I had years ago in another tank. (I bought this Achilles from a fellow reefer, that had it for 6 months and it eats pellets, so I could not pass on the chance). I run a UV and a Curve 7 skimmer with a fuge and sump.
All opinions are welcome.