I have returned Barney and Betty to the breeding tank and Wilma and Fred were back together, coloured up and flaring, defending their territory. I also spotted Wilma giving a leaf a good clean. Today there was also a 25% water change, that probably helped too.
Wilma isn't ready to spawn anymore. When she was pale and retreating she had reabsorbed the eggs, so it must have been for show more than anything. I will have to start conditioning her again. Not a problem, it's nice to see that she's better now.
I have got a new ph test today, and I got a measurement of 7.2. My old test must have been bogus, so that also contributed probably to wilma's sickness. I re-set the co2 yeast system, and will do another water change tomorrow with pure RO water, 25% again. Ph should drop to acceptable levels by tomorrow at this time.