01-12-2008, 11:36 AM
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Bacopa Carolinia thrives in my loach tank, and the water is pretty soft in there. (The light is pretty high, though - 3.8 WPG) I have had less (but not zero) luck with Bacopa under 2.2 WPG in a 55 with even softer water (unfortunately, the plecos kept rooting it up at night.)
I have dwarf sags in both my main loach tank (where they've grown into a lawn), and in my kuhli/oto/threadfin tank, where they're taller and don't spread as fast, but are definitely growing (15 gallons, no driftwood, 18 watts of light, but near a southern window.)
Another one I've had good luck with in soft and medium soft water under high and medium and low light - rotala indica. Makes a great, bushy, background plant if you trim it early and low.
You might could have better luck with the kuhlis if you put a sand patch in there. They love to dig.