worm id in live rock

bug in question, image hosting site is postimages since it came up first. this dude showed up on my GSP in a little barnacle/tube worm looking growth on sunday, noticed in the morning when I was switching lights from night to day the polyps on the GSP were all hiding, waited an hour and came...

I had an aptasia in my rock and I used F-Aptasia to get rid of. Then I noticed this right next to it. It’s wavey, could be from the flow but i am not sure. What is it? My tank is about 9 months old.

Found this thing on a chunk I got recently. I don’t trust my judgement, can anyone tell for sure what this is? I know the picture’s not great, but I don’t want to risk messing with it for a better one :downcast-face-with-sweat:

Hello my name is Kasey and I am new to the saltwater hobby. I have been in the freshwater hobby for 10 years and have finally converted to the dark side . I currently have a new tank set up (2 months running) with live rock, a bicolour blenny and a PJ cardinal. When looking at my tank I notices...

I have these “worms” in a few spots in my 55 gal reef not sure what they are or if they are a pest or not.

Hey guys So we are a good few weeks into the 20 gallon and I have 6kg of live rock tank mates are Nasarrius snail, 2 red legged hermits and a turbo snail who is doing a great job on the algae clean up. The rock is covered in copepods but I noticed a weird tentacle earlier! There was a small...