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RE: A 9 year old substrate...

James went on at length and mentioned that you're using reconstituted
water and have symptoms like calcium deficiency. They could be just like
boron deficiency if you're reconstituting your water. One of the nice
things about tap water is that it contains lots of minerals and
nutrients, that you need to add back into "pure" water in order to make
it acceptable for growing plants. Boron is nearly always present in tap
water and you only need a tiny tiny amount. You can dose to about 0.03
ppm (elemental B) i.e. about 1/3 of your Fe requirements.
Steve Pushak                              Vancouver, BC, CANADA 

Visit "Steve's Aquatic Page"      http://home.infinet.net/teban/
 for LOTS of pics, tips and links for aquatic gardening!!!