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So I picked up some super porous black lava rock for a shrimp tank I’m getting ready to build. It has what looks like mineral buildup all throughout the holes and crevasses. I hosed them off and tried brushing with a nylon brush but it’s not coming off. Any suggestions for cleaning this kind of rock? I assume if I leave it on, it will slowly dissolve and harden my tank water, which I don’t want.
I did a vinegar test and it didn’t react.
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I did a vinegar test and it didn’t react.

Sent from my iPhone using Tapatalk