Quick visuals.
bite marks, can be hard to see.
egg clusters at base of coral, easier to see, looks like masses of frog eggs
no polyp extension, particularly seen on milliporas, a favorite target.
Faded colors on pieces in an otherwise vibrant tank.
worms are not visible on wet frag, but if you blow on it slightly to dry it, you may see "wet" circular patterns, this warrants closer inspection with magnifying glass. Even under a microscope, they are tough to see unless they move. Don't trust your eyes.
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Brad
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