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Problems with Cryptocorynes

I have several species of Cryptocoryne in my 75 gallon community tank.  They
are all exhibiting he same symptom.  The margins of their leaves curl down and
inward.  In addition none of them are growing as lushly as I would like.  My
tank conditions are as follows:

	75 gallon community tank
	200 W Fluorescent lights
	pH 7.0
	KH 1 degree
	GH 5 degrees
	Fe 0.1 ppm
	Nitrate 5 ppm
	Ammonia and Nitrite 0 ppm

I fertilize with PMDD at 0.5 ml/day and 0.1ml/10 liters of water change.  I
try to change 15-25 gallons weekly but sometimes only make it every other
week.  Filtration consists of an Emperor 250 and a Penguin 180.  No carbon
dioxide.  Any ideas as to the cause of my Cryptocoryne leaf curl and lack of
lush growth?


Chazz Hesselein