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.