http://weloveteaching.com/puregold/
go to GF essentials
you need to get testing kits for ammonia. it is possible that even that few GF are
making too much ammonia in the tank.
Ingrid
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Somewhere between zone 5 and 6 tucked along the shore of Lake Michigan
on the council grounds of the Fox, Mascouten, Potawatomi, and Winnebago