Why did everything dies? What happened??
Honestly, I still dont know exactly what happened. Things started slowly declining, and it just snowballed. After most of the acros died, I let the tank go and just neglected it. Then it became more than just a afternoon to remediate.
So, I spent most of today pulling out old sand, and rinsing new sand to get it all in and done with. The fish went back in around 7 this evening. I just tossed in the rock - Ill work on aquascape later in the week. I had a lot more snails than I thought I did in the tank - Im a little worried that my cucumber will croak, since there's very little in the sand bed to feed it, but Ill keep an eye on it and see how things go.