06-28-2007, 03:35 PM
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Originally Posted by jones57742
This is "just not a good idea".
Even as you put it LTB if it is a "heavy clay" by definition is composed of very, very fine minerals.
The clay will swell and the surficial minerals will dissolve.
Also, as stated earlier, the material may have impurities which are detrimental or lethal to fish.
I agree. Specially if it is a heavy clay. Where I live, we have a lot of expansive soils. The clay we have I call pottery grade clay :P and it really wouldn't be good in an aquarium. Rocks are one thing, but still should be checked out by an experienced geologist.