Pygmy Cories - 2 With Missing Parts Of Tails, And 1 With A Spot & Bent Spine

As an update on this, following treatment and a few extra days in the QT, I "decommissioned" the QT. In the past few days:
* Tail-less Cory has been settling in better in the main tank after initially remaining subdued - he is now happily foraging away like his peers and adapting well to his tail-less state. 
* Bent Spine Cory's spine seems to have rectified itself in both fracture-like sites and his swimming action is with his caudal fin swishing from side to side rather than plunging up and down, so much so that, if it weren't for the healing wound, he wouldn't be distinguishable from his two normal peers.

Fingers crossed, all will remain well, but I'll continue to keep the close eye on them and all the other fish, as well as the water quality, as I always do.