Chara, how to grow it???

[RoundUp]

I am trying to grow the sweetwater algea Chara globularis and have some 
problems with it.
I grow it in a tank with 16 h light in tap water supplemented with 36 
mg/litre sodium carbonate, 23 mg/litre calcium chloride and 50 mg/litre 
magnesium sulphate. It seems like the algea is not growing very good so 
if someone has experience with this please e-mail me or post here.

Lars.S at Plantbio.lu.se, Plant biochemistry, Lund University
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