Is this flashing?

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jelazar

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No, that's not flashing.

Flashing is when the fish starts from a few inches above the sand bed, and suddenly swims directly at the sand. The fish does a u-turn at the last second, so that it only grazes the sand with it's side.

A fish can also flash against the side of the tank, a rock, or anything else solid.
 

Polyp polynomial: How many heads do you start with when buying zoas?

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