If you going store NSW, keep in the dark and don't "turn" with a powerhead. The dead creatures from the water will settle at the bottom of the container. When needed siphon off the water leaving the last few cm's of water and dead muck behind.Just keep NSW turning with a power head (am i right guys/gals?) and try to keep it at a constant temp?
Then do whatever your heating/airation method is and add to your tank.