CT_ Posted February 12, 2022 Share Posted February 12, 2022 I picked up something that was called "black axe stone" for a (cherry) shrimp tank I'm setting up and when i brought it home I poured a little acid over it and it fizzed quite a bit. I'm told this is the test for "unsafe" rock but I'm not totally sure why. If I'm going to be using crushed coral anyway does this rock really pose a risk? Link to comment Share on other sites More sharing options...
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