What are these encrusted things on my rock?

[senorsancho]

So I have been seeing my tank recently have like single strings of what appears to algae that gets caught up around corals here and there and are easy to move and get sucked into filtration, but I see that they are coming from these little encrusted stick-like figures that are on the rockwork. Does anybody know what these are and if they're bad and how to remove?

Here's some pics of what they look like (they're the little tiny stubs in the center of the pictures):

Also can anybody help me identify what this is that my palys are growing around? Its like a clear looking sphere that's in the middle of it but it seems like my palys do not mind and grow from it.

 

[35ppt]

First two photos are vermetid snails. The last photo is sponge. The vermetids can be dealt with by either removing 100% of the tube and spiral base or by placing a dab of super glue on the opening. The sponge should be fine unless it starts to overgrow the palys of course.

 

[senorsancho]

First two photos are vermetid snails. The last photo is sponge. The vermetids can be dealt with by either removing 100% of the tube and spiral base or by placing a dab of super glue on the opening. The sponge should be fine unless it starts to overgrow the palys of course.

Oh wow thank you so much yeah I had never seen either of these things before! Are the vermetid snails a nuissance are there any fish for a nano tank I can use to get rid of them or no? I'll probably just scrape the tubes as I see them but would like to get rid of them completely over time. Oh okay cool hopefully the palys win the war with the sponge lol

 

[TrevorHorn19]

I was able to keep my vermitid snails at bay by adding a few bumblebee snails. Some people haven’t had success with them but it worked for me.