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Re: substrate recipes

In a message dated 10/30/1998 4:01:11 PM Eastern Standard Time, karen randall

> 3. Mix it with the bottom 1/3 of your 1-3mm non-calcium carbonate bearing
>  gravel
>  4. Cap with 1/3 well washed PLAIN non-calcium carbonate bearing gravel
>  (total depth at least 3")

i must have missed something.  what's the difference with the carbonate
bearing gravel?  what is the harm of carbonate gravel?

tsuh yang chen, nyc