I also suspect one of the 2 files is nipping at my gorgs & leathers, but I haven't caught which one it is yet. Always a risk with them, but I have a high success rate with finding good ones for the tank. Sad my last one didn't make the transfer.
Very first in the 90 was a no go, 2nd was great but lost it to a bully eventually. 1st in Cade was great, same bully caused it to jump a few months in and I didn't find it in time. Bully got rehomed, 2nd in cade was great, didn't make the transfer. 75% success with non-nippers headed into this duo.