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Ech cordifolious problem



I have several Echinodorous cordifolious (Spade leaf Radican Swords) that are 
in
the 18 to 24 inch range.  Suddenly the newer growth on these plants is turning
reddish brown.  Anyone have an idea what they could be lacking?  dKh = 5.5,
pH = 7.4, Lighting 130 Watts on 70 gallon tank. (Croma 50's, Daylight, and 
Actonic
bulbs.  

Dennis