Re: Aquatic Plants Digest V2 #209

> Now the PH constantly increases to 8.2 or more.  Even when I 
>adjust the PH down, it raises again.  

>Does anybody have any idea what is going on?
>Since my PH is raising to 8 or more isn't the buffering effect of the 
>water exhausted?  Why would it still increase?  
>Please help me.  I am on the verge of tearing down the tank and removing 
>my soil mixture and cleaning my gravel.

I had the same kind of problem: pH sitting at 8.5 or higher. I had been told
by an aquarium store manager that putting coral gravel in my tank would not
cause a problem if I just had a small dish of it as a "pond" in the tank. I
think he just wanted to sell lots of pH controlling products. I tried
everything to get the pH down: Vinegar, Muriatic acid, pH down, CO2, you
name it. Finally I gave up, tore the tank down, cleaned the gravel
thoroughly and started over again. In the process I also found out that one
of the pieces of wood I had in the tank was buffering the tank's pH up also.
With the removal of the coral-gravel pond and the offnding wood, my pH sits
at 7.0 to 7.2. My plants are happy.

Justin P. Healy in cloudy Savannah.