Now I undersand. I did not realize that they were in QT already. Well....what I would do is:
1) As long as the salinity and chemical balances are about the same as the main tank. Go ahead and move them into the main. Maybe put them in some bags and float them in the main tank (or sump) in order be sure the temps are correct.
2) Once you add some of your tank water to the bags and wait a 15 mins or so. Go ahead and dump as MUCH of the water out of the bag as possible and put the tangs in the main. I MAYBE would net them but with them being tangs not a good idea since they have that spike on their tails.
***Others may not agree with my process, but this is what I have done several several times and I have been in this hobby for about 10 years with NO ISSUES in doing it this way.***
I hope this helps!!!