This is pretty common, especially if your messing about near their home. What kind of clown is it? I've owned a pair of captive bred Ocellaris, and the female would always nip me when my hands were in her space for too long, or I got near her anemone.
I also owned a Clarkii that would chase my hand away and then start nipping...
Maroons are well known for doing this as well.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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