Indeed!
Hey, where have YOU been?
Okay, when I got home this morning I discovered something that I somehow missed earlier, and it explains a lot. The rotten egg smell has permeated my whole house!
It seems that I got too careless when I added that last bit of water, and I wound up boring a big hole in the dirt as a result. That dirt was FOUL. The sulfide buildup was high, and it got released. My Java Moss all turned black in a day and a half! My snails were crying for mercy at the surface, and oily film coated the water.
So, lesson learned; don't do it like I did. Make sure your soil gets plenty of perforation. My dirt was surprisingly DRY in many places, having been too well-sealed from the tank's water by too much sand. If your dirt can't breathe, it's gonna go bad.
I can't wait to start all over again
.