The first move is not to ignore it. A pool that is visibly turning green usually needs more than a normal weekly stop. It may need brushing, cleanup, chemistry correction, filter support, or a full green-to-clean recovery depending on how far the problem has gone.
A lot of homeowners try a quick DIY shock and hope the issue disappears. Sometimes that helps, but many green pools come from a combination of chemistry drift, debris load, and filtration problems. If the underlying cause is not addressed, the water often slips right back again.
The earlier the issue is handled, the easier the recovery tends to be. That is one reason weekly service is so valuable: it catches small water issues before they become a major cleanup.