Will lace rocks raise pH?

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Fishface

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Will lace rocks raise my 7.0 pH?

I was told conflicting things by my local dealer (and yes, that is a witty drug parallel, haha)
 

Luniyn

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Generally lace rocks (or lava rocks) are ok to use in a fish tank. However, if you want to test them, you can put a drop of vinegar on it and if it fizzes then yes it's going to change your pH. Another test would be to put one in a bucket of water and test the pH... wait a week and test again. If the pH has dropped more then a points then yeah, it's gonna effect your pH.
 
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