Thanks for your query.
Noted your history of passing string like things in the stool and eating seaweed yesterday.
The picture is very clear and shows the sea-weeds.
So stop worrying. These may pass for a few more days.
If this continues, please see a Doctor.
I hope this answers you query.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.