11-16-2009, 06:55 PM
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I found an interesting article, don't know if it will help,but figured I would post it:
If your saltwater aquarium smells like rotten eggs (or eggs in general), you’re smelling hydrogen sulfide. In an aquarium environment, hydrogen sulfide is usually caused by organic material (i.e. food particles, feces, dead material) rotting in a place without oxygen.
Usually the only non-oxygenated area in your saltwater aquarium is beneath your substrate. Organic slipped beneath your substrate and is decaying without oxygen. This is basically the nitrogen cycle without the oxygen.
Hydrogen sulfide could occur if you’ve had a power failure and organic material left in the filter has started decaying without oxygen. Make sure you flush out your filter before starting it back up, in this case.