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Re: Perlite

A few days ago someone asked about using perlite.  The big problem with 
perlite is that it floats.  Some bits may sink, but if you ever get perlite
into your tank, you will be picking bits out of the floating plants forever.
I'm also under the impression that it is hard enough to scratch glass. You
probably don't want to use it in an external filter, let alone in the tank.