well I solved the mystery. Tonight I come home, still no damsel. Yesterday I qt'd the angry damsel just to teach it a lesson. Well, apparently the missing damsel came out of hiding today and got sucked into the overflow (wasnt there yesterday). There she sat, happy as a clam with no one to bother her. I took the bad damsel
out of QT and back into the main tank, then QTed the Damsel formerly known as missing. She has lost most of her tail (no doubt from the evil damsel) and needs time to recuperate.