Brown algae is a common problem in many fish tanks, especially those that have been recently set up. It’s not dangerous to fish but can turn your beautiful aquarium into an ugly mess. This slimy layer ...

The brilliant glow that certain types of photosynthetic organisms cause has hidden dangers Bioluminescent algae are a group of tiny marine organisms that can produce an ethereal glow in the dark.

A toxic algae called “Heterosigma akashiwo” is blooming in San Francisco Bay, causing the water to look murky and brown and posing a danger to local marine life. The ongoing bloom could kill fish and ...