The "Red Tide" is currently hitting Florida's coast and is spreading, causing the National Oceanic and Atmospheric Administration to warn coastal states of a rise in toxic algae.
It has killed various forms of marine life from fish and manatees to turtles and even sea birds.
The phenomenon is an algae bloom that depletes oxygen in the water and produces toxins.
Officials are warning that this phenomenon could take place for several more months.
Florida's governor Rick Scott has directed around $700,000 to help kill the algae around Fort Meyers alone, but says more needs to be done.
NOAA says that red tides have shown up in all U.S. coastal states and it's possible that they'll start happening more often.
In some cases, the algae can be harmful to people causing breathing issues, eye irritation or asthma.
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