The Planted Tank Forum - View Single Post - Dead snails in substrate
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Old 01-10-2013, 12:41 AM   #3
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Your substrate went anaerobic. It doesn't take much organic matter to smell - without oxygen, the bacteria in the substrate will making things like hydrogen sulfide instead of carbon dioxide.

Rinse it a few times and then put in your plants. Do lots of water changes up front and you should be fine.
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