Sounds like ick. you could either put them in a hospital tank or treat your whole tank. but that is up to you. you can find plenty of ick treatments at your lfs. ick is usually caused by a fish being stressed or it the fish already had it when it was introduced.
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I have recently started Nano reef tank
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so im assuming you didnt cycle the tank. Cycling usually takes at a minimum of a month to complete. Don't worry you only have to cycle the tank once. you should take a look at cycling your tank sticky. if you already havn't, you should purchase some test kits from your lfs like
ammonia
nitrite
nitrate
ph
ect.
you are better off to get the liquid test kits because they are more accurate and last longer. and being accurate is a very crucial matter in a aquarium. your fish's lives depend on it.
keeping a aquarium or tank is a great hobby to have so don't give up, and keep alot of patience. in the end its all worth it.
Good luck with your tank
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welcome to the forum