Shoaling? Never would have thought but perhaps it depends on the gender.
I got three in 2015. One was killed in the 240 gal jerk tank a year or two later at 8" or so. One died for no good reason a year or so later at around 10"-12". The last survivor plus a 12" rescue that came in around that time reached 1.5' but no more and wouldn't share anything in a 25K gal. One was a constant chaser and the other a regular challenger and wonderer into the territory of the alpha aka the feeding end of the 50 ft tank
I hypothesize they both are males because of smaller size or slower growth. Well, one still is and the other was. After I placed beluga sturgeon into the 25K, they had to go. The one which went into a 240 gal is still with us. Doesn't grow whatsoever it seems. The other (the rescue) was housed temporarily in a QT 120 gal, less than half filled, hence covered loosely, until I decided where to house it, but it wouldn't take the temporary cramp and jumped out on day 2 or 3 to its demise and my learning that they do jump when needed.
I got three in 2015. One was killed in the 240 gal jerk tank a year or two later at 8" or so. One died for no good reason a year or so later at around 10"-12". The last survivor plus a 12" rescue that came in around that time reached 1.5' but no more and wouldn't share anything in a 25K gal. One was a constant chaser and the other a regular challenger and wonderer into the territory of the alpha aka the feeding end of the 50 ft tank

I hypothesize they both are males because of smaller size or slower growth. Well, one still is and the other was. After I placed beluga sturgeon into the 25K, they had to go. The one which went into a 240 gal is still with us. Doesn't grow whatsoever it seems. The other (the rescue) was housed temporarily in a QT 120 gal, less than half filled, hence covered loosely, until I decided where to house it, but it wouldn't take the temporary cramp and jumped out on day 2 or 3 to its demise and my learning that they do jump when needed.