Unknown worm? Google was no help.

[Wrasse-cal]

What is this? I found it stuck to the tank glass a few minutes ago...

 

[Homelander]

I actually think that might be a cucumber.

 

[Wrasse-cal]

I actually think that might be a cucumber.

That'd be unexpected. It moves those tentacle like appendages rapidly enough to notice. It can twist the body portion as well. I've no experience with cucumbers, but I would have assumed they'd be more sessile?

 

[Flippers4pups]

Medusa worm.

https://www.advancedaquarist.com/2002/11/inverts

 

[Flippers4pups]

I would remove it. They can die and release toxins that can kill fish.

 

[Wrasse-cal]

Here is a little .gif of it moving around.

I'll remove it.

 

[Homelander]

I would remove it. They can die and release toxins that can kill fish.

nothing in history with the name medusa was ever good. At least this one won't turn you to stone.

 

[Maritimer]

Medusa worms are actually a form of slender sea cucumber. As far as I know, holothurians (cucumbers) only release toxins if they die under violent circumstances, such as being attacked by a predator or shredded in a powerhead. If they die under non-violent conditions ... well, they can produce ammonia . . .

Otherwise, cucumbers are amazing members of your cleanup crew, sifting the substrate and even the top layer of the sandbed for any organics. I personally like 'em a lot, and have a couple of cukes in my tank.

~Bruce

 

[samnaz]

Super cool! I’d keep it.

 

[cristata.reef]

@Kamden Uelton you still want one lol

 

[reef lover]

I'd keep him...

 

[Kamden Uelton]

He's a Medusa Worm, They are VERY poisonous so just make sure he doesn't get stressed out too much... They have a symbiotic relationship with Emperor Shrimp which will clean parasites off of them.

 

[revhtree]

Very cool!

 

[Wrasse-cal]

Thanks everyone...with some regret I remove the little bugger.

 

[ScubaShane]

Thanks everyone...with some regret I remove the little bugger.

Better safe than sorry is best in this hobby.

 

[C.bldwn]

I would remove it. They can die and release toxins that can kill fish.

They are very beneficial and can actually be purchased from GARF.org in there GARF grudge as well as seperately, atleast they used to be anyways. And even if it died in a pick tank it wouldn’t be anywhere near enough toxins to effect anything. I had 2, 8-10” cucumbers 1 in my display and 1 in my sump and over the years they has split and multiple times and at 1 point I was up to 5 or 6 but have since lost all but 2 (1 tiger, 1 black) and never had any negative or even noticeable effects when they did and that was in a 125 gallon sps tank which I don’t run any carbon or any filtration besides my refugium and I only do 20% water changes 1-2 times a year.

 

[Wrasse-cal]

Well, in the past 24 hours, I've noticed two more little medusa worms. Both were floating in the water column and got sucked over my overflow. I would assume there are more.