hammer coral-what is up with this tentacle?

melonheadorion

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just did a water change, and while the tentacles were a little retracted, i noticed this tentacle looking a little wierd. dark area on it, and looks defalted. the rest of the coral looks completely healthy, so i am not too concerned, but since i am newer to coral, i was curious as to what this is/the cause/anything to watch for or be alarmed with?

i zoomed in as much as i could
20210801_153544.jpg
 
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