Plants:
bolbitis: regular and small forms
all mosses
java fern
downoi
most crypts
pelia
subwassertang
bolbitis: regular and small forms
all mosses
java fern
downoi
most crypts
pelia
subwassertang
blyxa japonica has also grown well for me in hard water. I definitely wouldn't try syngonanthus in hw, but they've done well for me in water with a gH up to 9, although kH was 0-1.thanks guy, but still most of the good looking plants are from soft water.
i would love to see Limnophila aromatica, Ludwigia inclinata family plants to grow in hard water. i know i don't have any chance with Syngonanthus family plants in hard water.
i was able to grow Cabomba furcata, Eichhornia diversifolia in hard water without any problem though.
???? Crushed coral makes water harder, not softer.I had a problem with hard water from time to time in my area, and it's hit or miss but I have heard that buffering the water with some crushed coral will soften the water back to where you should have it.