Red tide blooms occur almost annually on Florida’s west coast, often killing other marine life and costing local economies millions of dollars per outbreak. NCCOS-funded scientists have found that clay treatments may offer a way to control the blooms without harming co-occurring marine animals, like crabs, clams and urchins. 

https://coastalscience.noaa.gov/news/new-research-examines-the-use-of-clay-to-reduce-the-effects-of-habs-in-florida/