What is this in my sump?

[kagisexton]

They are very tiny, only have seen three, the largest is 1cm. I am pretty sure they are just common sea cucumber (Stichopus mollis), but am scared they are nudis. I have no idea where they came from, I used dry rock and dry sand.

Can anyone identify? It was super hard to get a pic. I have never seen this on any hitchhiker list.

 

[kagisexton]

I’ve also heavily dipped every coral and quarantined every fish that has gone in (not like that part matters)

 

[sergifed91]

Looks like pineapple sponges. Sign of a good tank.

 

[kagisexton]

Looks like pineapple sponges. Sign of a good tank.

Are you talking about the spirorbid worms? I am referring to the thick green slug with spikes in the center of the pic.

 

[Gtinnel]

If we're talking about the thing crawling around the bottom it is definitely not pineapple sponge. I don't know what it is though.

 

[JGT]

Cuke.

 

[kagisexton]

Lifted the rock out of the stump, found like 5 others, looked under another and the same.

 

[kagisexton]

Does any one know if they are something I should be removing or are they harmless?

 

[sacutshall]

I'm thinking maybe sea hares.

 

[ReefRusty]

I would always remove what I have no idea what is in my tank.

But some sort sea slug.. search/ google them

 

[Just John]

Juvenile sea cucumbers for sure. Friendly, but if attacked some will release powerful toxins that can kill fish. I don't know if this is an issue with all of them considering that you can buy them at the LFS. Be gentle removing them if you do. If they are small enough you could siphon them out to avoid any toxins getting into the tank.

 

[kagisexton]

Juvenile sea cucumbers for sure. Friendly, but if attacked some will release powerful toxins that can kill fish. I don't know if this is an issue with all of them considering that you can buy them at the LFS. Be gentle removing them if you do. If they are small enough you could siphon them out to avoid any toxins getting into the tank.

Awesome, thank you.