re:Urgent help needed!!! PH going downnn....

> From: DAWB.DSKPO33B at DSKBGW1_ITG.ti.com (David Webb)
> Your plants may be de-calcifying the water.  Actually, this should be 
> de-carbonating the water IMO, but this is the term.
> Some plants, in the absence of enough free carbon dioxide in the
> water, are capable of removing dissolved carbonates from the water to
> provide their carbon needs.  Others can't.  This may also explain your
> poor plant performance.  This is measurable as a drop in your KH.

The term used in _The_Optimum_Aquarium_ and a few other resources is 
"biogenic decalcification" and causes the pH to go UP not down.