The Planted Tank Forum - View Single Post - Dead snails in substrate
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post #3 of (permalink) Old 01-10-2013, 12:41 AM
Algae Grower
Join Date: Jun 2007
Location: River Falls, WI
Posts: 34
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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