Well....
Not so good...
Unfortunately, I think brooklynella had severe sonsequences. It was either that or MV, but I think it was brook based on the delay - three weeks - and the speed with which it hit - no observable symptoms to total loss in 36 hours. For those who will ask, I QTed for ~2 weeks and put them under observation, but nothing was treated during that time, before adding them to my tank. I was honestly very saddened, so I decided immediately to go fallow for 15 weeks (which ends mid-July). Since this, I've pretty much ignored my tank. You should see the coraline growth on the glass, I don't even know what's going on in there right now and it's going to take a few razor blades and some elbow grease to get through it...
The lfs owner has been awesome through this. He did the two week QT in a standalone system he set up specifically for my fish, claimed responsibility and completely unexpectedly offered to replace the fish. Although I told him I didn't think he was at fault, he insisted. Pretty awesome, really.