Tank smells powerfully of rotten eggs

[asylumdown]

So it looks like We've solved the problem, it was the drain trap in the emergency drain under the sump that had dried out.

With all the people that have been here, I didn't open the doors to the cabinet for several days, so the sewer gas was building up above the sump for who knows how long, and enough of it must have diffused in to the water to make the water smell. I siphoned some water in to it, and the smell in the house was gone in an hour. I switched my GFO reactor to a carbon reactor, did a 50 gallon water change, and the smell is now completely gone from the water. A couple corals have bleached a little, but things seem to be ok as far as I can tell. I'm going to need to remember to fill that drain on a regular basis.