I have two batches of normal black mollies (around 1-1/2") that have gone through extensive acclimation. First batch, 8/10 survived from 1.001 to 1.026 over 3 weeks. Second batch just hit 1.026sg this weekend after around a month, I have 7/10 remaining, unfortunately both males died. They seem to have plateaus at around 1.015, and then again around 1.20.
The larger sailfins seem to tolerate higher salinity better, and potentially higher flows better. I have my first set in my frag qt tank in the sump to clean it up while I check to see if ich hits on them. They are doing just fine in there and I'll most likely just keep them in both parts of the tank. The second set I was hoping they would be breeding by now, but again, no males made it.