What are these green things on my rock?

MissA

New member
Hello everyone! I’m new to the marine tank hobby, I’ve had my tank cycling for just over a week and added this rock today, wet from my lfs. These long green parts that look like sticks are attached. A couple of them have a feather type end. Can someone help me identify them, and let me know if they are a good thing? I tried google lens but got all sorts of results and got a bit lost. Thanks a bunch!
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Welcome and agree with the above. Harmless filter feeders. The smaller ones you will typically see come and go based on my experience
 
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