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Wow, that's a first for me, lol. I wonder if the black is caused by cyano bacteria, or sulfates? Either way, I would skim like mad until it's clear. You're probably getting the nutrients out of your rocks though, so that might be good.
Is your rock black now too? I bet it smells like sewage. Have fun, lol.
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The Sand People are easily startled, but they will soon be back, and in greater numbers.
All statements have been peer reviewed.
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