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[Coasting]

It wont sting them, but it might irritate them in the same sense as you sticking your finger in there and poking them.
If its not bugging the torch, I would just leave it be, but if you notice it touching the torch, and the torch isn't extending as much on that side because of the touch, just glue its little hole shut.

[saltyair]

barnacle - perfectly fine will not harm anything actually a blessing and a good thing - I have a nice size one in the middle of my torch coral. I have had it over 2 years

[reefwars]

Common wild torch symbionts not harmfull and a nice hitch hiker