Need help identifying these things in tank

[Q50sReef]

What’s up fellow reefers , I was away from my tank for a month unfortunately when I got back it was A mess I did a water change and cleaned the glass and started inspecting that’s when I saw these things -are they harmful? How do I get rid of them? I currently have no fish and only 2 zoas

 

[stanleo]

The first pic is hydroids. Not harmful, just annoying. The next pics look like tubeworm tubes. Harmless filter feeders

 

[Q50sReef]

The first pic is hydroids. Not harmful, just annoying. The next pics look like tubeworm tubes. Harmless filter feeders

Thank you so much!