Yup. The aeration stone/wand + O2 tank is, in hindsight, one purchase I wish I wouldn't have spent the money on. The setup mostly collects dust in the closet now due to how much of a PITA it is to keep in pristine working order plus I never saw any noticeable change in taste of beer, health of fermentation or time to fermentation completion for normal gravity beers compared to starting with "ready to rock" yeast and a healthy shaking/splashing of the wort before inoculation. If I were making a huge beer, I guess my normal MO would be to wait an extra few weeks in the primary anyway so NBD.