I googled that and found this article: https://www.aljazeera.com/news/2019/05/decomposing-algae-ruining-beaches-mexico-190510091141763.htmlSargassum is the term to search
Hi- We were at Vidanta RM April 27- May 4. Sargassum was being raked and piled constantly. Yes, I heard it was pretty bad in PM and PDC. There was a smell on one of the days at the Beach Club Pool, but it didn't last. None of this spoiled our glorious 2 weeks there, though. Weather was perfect, great friends and family travelled with us, food & drink (at the few restaurants that were opened!) was delicious, and I can't wait to return.we were at Lagunamar in Cancun 3 times in the last 14 months: March and late October 2018 and again in March 2019, absolutely no issue with the seaweeds. I hope they will be able to do something about it thought, i heard that in Playa del Carmen it was pretty bad.
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