gamefreek101 Posted July 8, 2014 Report Share Posted July 8, 2014 can you use volcanic scoria stone in a sump as it looks like it would hold a lot of bacteria .? Quote Link to comment Share on other sites More sharing options...
livingart Posted July 8, 2014 Report Share Posted July 8, 2014 Yes you can but because of the way it is created it can contain heavy metals which require special tests to determine their prescence. IME I havent seen a marine tank containing scoria that has been running longer 12 months. Quote Link to comment Share on other sites More sharing options...
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