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Keep an eye on them and look for Nudibranchs during the day, they are very well camo'ed once you spot one you'll spot them all. If nothing during the day, use a flashlight at night and see if something is bothering them..usually a good time is when your tank has been completely dark for around 2 hours. Finally IMHO do a dip as a last resort, Paly's and Zoas close up from time to time anyway but if they start to dissapear then I would begin to worry.
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