06-02-2009, 08:37 PM
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From your information, I suspect the potassium. You might try a couple more partial water changes over a period of a few days. I would maintain everything else as always, the aim being to get them back to the regular schedule and balance of light/nutrients.
The bad leaaves will probably die, but new growth should start to appear after a few days once the offender is sufficiently diluted or gone altogether.
I recently used Maracyn to deal with columnaris, and only one round of three alternate day treatments, then a 50% pwc. About two weeks after, I noticed the pygmy chain swords literally began disintegrating into nothing, and the red leaved swords did much the same. The green leaved larger swords seemed much less affected. The Brazilian Pennywort was also affected by producing much smaller leaves and much further apart on the stems and more yellow than green, just the growth during those two weeks. Now after another two weeks, most things are coming back. I am certain it was the Maracyn; if you followed another thread on here, the same thing happened to that aquarist with maracyn to treat that algae-like bacteria (sorry, mind is going again, forgot the name).
This is the danger using any treatments, but of course we sometimes need to resort to such measures. I've had swords on the brink from things before and they have the knack of bouncing back because the roots remain good and are strong. Good luck.