Now this topic is in the disease and disorders section as most of these posts will be of a coral exuding its slime in a defensive manner but in reality this is really a protective mechanism not a malady, although it can be a good indicator of problems.In this first set of pictures the slime coating coming off is from a sudden change in the water from a regular cleaning.The added water was not similar enough to the tanks existing parameters and there is a huge load of corals so it almost causes a domino effect when each coral expelled mucus one after another.
You can consider this thread a Slimer Gallery
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some frags cuttin it loose...
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The euphylias were really nasty.