I used "the box" for a day and the exquisite was swimming by curious but seemed to have adjusted relatively quickly (hoping). I added a flasher a couple months back and there was some minor aggression for less than a day, so I'm hoping that is no different.
I had a lubbocks and solarensus in the box together hoping that they would also adjust together and they had no issues at all. After I released them, the lubbocks is out and about ( just a little chasing by the harlequin tusk - normally a model citizen, what's up with that??) and the solarensus found a place to hide and adjust to his new tank mates.
All in all, the critter carrier turned sideways so that the vents are facing the flow seems to have worked well.