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If you do a brief search in Google¹ or Wikipedia², you’ll get the general overview of this photosynthetic algae-like bacteria, discovering that it has been around throughout history. Scientists have documented its existence in freshwater, brackish and marine water, and discovered it hidden in fossils as well. Often referred to as “blue-green algae,” it is non-motile because its cells do not contain cilia, yet has the ability to spread via filamentous branching that bud and form new colonies elsewhere. Each cell wall is made up of a thick gelatinous membrane that helps hold it all together in the sheets we often observe in our aquariums.
It feeds on nitrogen and carbon, using ...

Stray electricity in the aquarium is unsafe for you as well as your livestock. Usually the only time it is noticed is when a person reaches in the tank with a nick on their finger, quickly feeling a tingle or even a jolt. After that unpleasantness has passed, it's time to determine what is causing it.

There are worse scenarios, such as that acrid smell, sparks, or even fire. Let's assume that is not the case, because if it is you should be calling 911 rather than perusing Reef Addicts.
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