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					Originally Posted by squibege  This may be a stupid question... But can you add Epsom salts? I'm assuming Magnesium Sulfate is Magnesium Sulfate...
 
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 Magnesium sulfate is just 1 component of a good magnesium  supplement.  Adding just Epsom salts could unbalance the sulfate ions in the tank.
See article 
http://www.advancedaquarist.com/2003/10/chemistry