Slate rock

[GARYSODERLUND]

Is it safe to put slate rock in saltwater tank without contaminating water?

 

[Mike J.]

I would say no, don't do it. Slate has iron sulfides and iron oxides as wells as other heavy metals that would contaminate the water. Iron shipwrecks have eliminated corals in the ocean around them.

 

[Mike J.]

Here is just one example. Think about the filtration, dilution, and currents the ocean has that your tank does not.
Black Reefs ? When the Ship Hits the Reef