Peter, you have summed up the situation nicely, thank you. More on this later…
For now, the P. nagyi have spawned today – the situation less than ideal with conductivity at ~100µS and pH of 5.9. However the eggs appear to have all stuck within the bubble nest/cave ceiling, so that is something of a relief.
Should I attempt to lower the conductivity over the next few days? Or just leave it as is and hope for the best?
Should I remove the female to another tank? Or leave her in and see what happens – I think I can net her out, if need be, fairly easily, as she prefers to hang out right at the front of the tank. Advice appreciated.
Here is a video combining about 4-5 hours of activity into 15 minutes. There is a lot of movement and the camera work is not so smooth…I post it for learning purposes so new paro keepers have some idea of how a spawning sequence may go in general terms, each species a specific case of course. I was not expecting this so soon, and I have to say it is quite an amazing aquaristic scene to observe. These really are cool animals!
Thanks again to everyone for suggestions and info.