So 25% WC down, gravel vacced the sand thoroughly, then did it again. I siphoned what I could off the rock with a turkey baster. Next, I removed what little rock I could and scrubbed them well. I blew off the rocks and added new floss and ran my MP10 on the highest setting for about 10 minutes, then changed the floss again. I usually run 4 tablespoons of BRS ROX carbon, but I added 10 tablespoons this time to account for die off. Finally covered the tank in mutiple layers of black trash bag- all sides and top. I'm running the skimmer for the blackout and added two air pumps which is really agitating the surface in the back chamber. I also left a "chimney" open up the back so CO2 can escape. My concern though are the fish... are they going to be okay as far as oxygen levels go?