In article .com,
wrote:
On Mar 12, 11:56 am, "David Kershaw"

I've not found anything that suggest they do better/worse in hard or
soft water.

My water is extremely hard - 1000ppm or so. Swords do fine and suck the
hardness right out of the water. I keep bits of coral in the tank so it
doesn't get too soft.

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