Originally Posted by fish_4_all
As for soft water being the culprit, I would have thought that the softness would have effected both the swords and the platties about the same since most live bearers like harder water but you may be right.
I cheated a bit on the platies. I put two fist sized hunks of rock that I think are feldspar in there to leech some calcium into the water.
That said, they seemed to withstand the cycling much, much better than the swords.
Logic is only the beginning of wisdom