It seems that the white dots on the anubias are nothing more than calcium carbonate deposits left by photosynthesizing bicarbonates in the water. It's a naturally occurring process and the deposits are seemingly harmless, although it's unclear why so much of it is appearing on these particular plants at this time. Possibly it's due to damage by a bleach dip before I added the anubias to the tank. There doesn't seem to be any causal link between the white dots and Mickey's sickness. Possibly the whole thing is just pure coincidence. I threw out some of the anubias anyway and there have been no further problems, touch wood.
The male threadfins are now in the tank and there was a happy and somewhat lusty reunion with their females as soon as they recovered from the shock of transfer. I'm happy to have both my tanks back to decent stocking levels again, the 64L is no longer overstocked and this tank is starting to come to life.
The male threadfins are now in the tank and there was a happy and somewhat lusty reunion with their females as soon as they recovered from the shock of transfer. I'm happy to have both my tanks back to decent stocking levels again, the 64L is no longer overstocked and this tank is starting to come to life.