10-15-2012, 06:26 PM
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Not sure where you read that Dwarf Hairgrass was "easy," many would not agree with you.
All "carpet" plants generally require brighter light and higher nutrients, and perhaps CO2 diffusion. Sometimes one of these species may "survive" in lower conditions, you don't know until you try. Amazon swords 9the green leaf species, not red) and Java Fern will usually be fine in moderate light with a decent nutrient supplementation (that does not need to include CO2).
The symptoms you mention are almost certainly light (not enough) and/or nutrients. Elocharis acicularis
, to give the plant its proper name, needs good light and sufficient nutrients. I can't offer suggestions on either as you haven't mentioned your setup, but if you do I will offer what i can.