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RE: Lava Rock sand...

   The lava rock sand should work fine as a substrate.  If it is anything 
like the stuff I am familiar with it will have a massive surface area, 
contains a fair amount of inorganic iron, and it looks good.  The only draw 
back I could see with it is if you are going to keep Corys in the tank.  A 
lot of that stuff has some really sharp edges.

Semper Fi