Is is a bug, or is it just new growth on the coral? Does it move? Might try poking at it with a pair ot tweezers and see if it is a pest that is latched on, or if it is just a new branch growing out. Personally looking at the left trunk, then at the right I think it is probably just new growth.
Also, it looks like it might be Nephthea, does the trunk of it have a neon green/yellow highlighter look to it?
Poking them didn't move it but last night when I looked both were gone and the flesh smooth like nothing was ever there. Hope whatever it was isn't harmful.
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