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Global extinction: Gradual doom is just as bad as abrupt

Harlequinmania

By Harlequinmania,
in General Reefkeeping_

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Harlequinmania

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Around 250 million years ago, most life on Earth was wiped out in an extinction known as the "Great Dying." Geologists have learned that the end came slowly from thousands of centuries of volcanic activity.

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1000 Gallon Tank in the Hole 

http://www.sgreefclub.com/forum/topic/120957-1000-gallon-3d-hole-in-the-wall/ 

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