What to do if roots are rotten?

[SouthPark]

Just be careful with this bag trick, as it's possible that what we think we're doing (keeping humidity high) with the bag to benefit it ..... could actually do the opposite. Enough air flow often means 'moving air' .... such as air moving passing (at least lightly) over the plants leaves and moving across the top of the media (eg. lava rock media) and even moving through the gaps in the media.