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Re: Profile

Bryan Bankhead wrote;

<I used Profile soil in a ten gallon tank using a Jim kelly style sand
<over vermiculite substrate and while I got good plant growth I also had
<a serious GH problem. I would reduce the hardness with changes and it
<would be back up within a day! And the hardness built up during the
<space between changes. Just how much did you use? I used two quarts in a
<ten gallon tank. Think I used too much?

I encountered a similar problem in a recently set up tank using a sand
over soil substrate. I was losing rasbora on a daily basis until I had
the presence of mind to test pH and KH. The latter had risen from 1 to
7; hence, the ammonia released during water changes were killing the
fish. It had not occurred to me that the sand would be so alkaline. I
thought that any carbonate in the sand would have been dissolved away
centuries ago. I have often added powdered dolomite to tanks with very
much less effect upon the alkalinity.

Dave Whittaker
Gloucester, Ontario
ac554 at FreeNet_Carleton.ca