Please help me id these “worms”

DukeReef

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Hello everyone,i was just notice these guy pop up everywhere in my tank...anyone wat are these? harmful or no ,along with treatment if harmful,thanks

D954498D-E2AE-4410-889E-6BE70EDE97A5.jpeg
 

SHNICI

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nudibranchs, they are feeding on the feather dusters worms like I know they don't touch anything else
 

vetteguy53081

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Hmmm, look like these ?

1603247229490.png
 

SHNICI

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@KJ ?
Sorry I just miss the name you name it 2 days ago and can't find the post with the same nudi
 
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SHNICI

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Vayssierea Sp.
@Crabs McJones was one who name it I found the post.
@vetteguy53081
 

samnaz

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Vayssierea felis, I believe. One of the few kinds of good sea slugs. You’ve got quite a few there! I’d take some off your hands for a small fee if you wanted, jsyk if you want to rid them for whatever reason :)
 

KJ

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Vayssierea Sp.
@Crabs McJones was one who name it I found the post.
@vetteguy53081
Wrong ID this is Elysia sp not a Vayssierea sp.
 

SHNICI

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Wrong ID this is Elysia sp not a Vayssierea sp.
Sorry, it's my fault then.
I don't saw the parapodia on the OP photos, and because of the colours I see (Elysia SP - Green/ish, Vayssierea - Orange) , I make it wrong. I don't see any photo from the side of it, and now probably you figure it out by the darker lines on it, I don't look at them.
And reading about, Elysia is reef safe algae grazer.
 
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DukeReef

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Sorry, it's my fault then.
I don't saw the parapodia on the OP photos, and because of the colours I see (Elysia SP - Green/ish, Vayssierea - Orange) , I make it wrong. I don't see any photo from the side of it, and now probably you figure it out by the darker lines on it, I don't look at them.
And reading about, Elysia is reef safe algae grazer.
No ur 100% right,they are in orange,they was just having good meal lol,all fat and healthy
 

KJ

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Sorry, it's my fault then.
I don't saw the parapodia on the OP photos, and because of the colours I see (Elysia SP - Green/ish, Vayssierea - Orange) , I make it wrong. I don't see any photo from the side of it, and now probably you figure it out by the darker lines on it, I don't look at them.
And reading about, Elysia is reef safe algae grazer.
The link you posted has wrong ID. On this post you are correct sorry for the confusion KJ.
 

SHNICI

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The link you posted has wrong ID. On this post you are correct sorry for the confusion KJ.
Thank you @KJ for the replay about. I'll try to be more careful, not to confuse someone with wrong info :)
 
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