The light green seen here along Namibia's coast is not from phytoplankton bloom, but from hydrogen sulfide emissions.
Performing mini flood/soak/drain every few days during this dry start. Trying to lessen the initial impact of using soil ammonia tannins algae kaboom. Smells awful hydrogen sulfide i believe.. #aquascaping #dirttank
Sulfur on a rock caused by volcanic gas/ Hydrogen sulfide often results from the microbial breakdown of organic matter in the absence of oxygen gas, such as in swamps and sewers; this process is commonly known as anaerobic digestion.
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Mexico: "Cenote Angelita (Angelita means little angel) is a deep water sinkhole and dive site. There is a cloud of hydrogen sulfide at around formed by the decomposition of organic matter in the absence of oxygen," writes photographer Tom St George.