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This is some sort of puncture wound either from urchin or other object and should heal on its own but do keep an eye on it for any development of sore or infection
They can very well be your culprit especially at feeding timeThanks!
Ill keep eye. I lve seen my clownfish being agressive and they are standoffish to each other and the tang forsnt back down. It happens twice a say I would say but not sure if the clownfish did this