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[APD] is adding lime to a clay substrate a good idea?

I live in the southeast USA and the water tends to be pretty soft in the area. I'm setting up a new tank, and since I'm extremely against the idea of spending $20 for a bag of dirt(laterite), I'm going to lay down a layer of red clay on the bottom covered with local creek sand. This seems to have worked well with my last tank, with the exception of the layer of top soil I used in it, which I think is part of the main cause in my on going BGA problem.

Anywayz, My present plan is to put down 1/2 to 1 inch of red clay mixed with lime on the bottom topped with creek sand. My big questions are:

Is this a good idea? or not?

How much lime would be a good amount?
Is there such a thing as too much?

Thanks for the help,

   derek parr                          http://www.derekparr.com

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