Weird things on my pipe organs!!

[coral papa]

I saw these two weird things on my pipe organs, help my id them

 

[lapin]

I only see what looks like a “sea slug” in the first picture

Aquarium Invertebrates: Sea Slugs - Part 1

I also hope that I have given the adventurous and experienced aquarists who read this a better idea of what to expect if you decide to ignore my advice and get one of these animals for your tank anyway.

reefs.com

 

[coral papa]

I only see what looks like a “sea slug” in the first picture

Aquarium Invertebrates: Sea Slugs - Part 1

I also hope that I have given the adventurous and experienced aquarists who read this a better idea of what to expect if you decide to ignore my advice and get one of these animals for your tank anyway.

reefs.com

It hasnt moved at all