silica sand

[trottman]

should this not be used for an sps tank? if only used in the fuge?

it is quartz sand to be exact..

looking at this article, it looks like t should be pretty safe if not benificial http://www.advancedaquarist.com/issues/jan2003/feature.htm

 

[kozmo02]

it's hard to say how it will effect your tank, personally i would not recommend it though.