Can I Use Seachem Fluorite Black Sand With Corys?

I found this for U.S. folks. Has anyone used it? Is it worth the extra cost?



If not, could I use Quikrete brand play sand? I saw another one that said "not for aquarium use". The Quikrete didn't say that, so I am thinking that maybe it would be ok. (Granted, it's not black, but its only $3 for 50lbs, instead of $4 for 5 lbs. BIG difference!!!
 

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