id on slug please

Anthonykp17

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does anyone know what this is

i know its a sea slug but is is bad or good

also how on earth did it pass my dips
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Does it have a shell inside of it? Could you get some straight-on, side pics of it showing the full length of the specimen (including the antennae)?
no shell i can see but not touching it
here are some better pictures. it has white tips on the antennas
 

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Definitely a nudibranch of some sort
yes i know that
my first though when i say it on the glass was holy moly. thats a big flat worm
but once i took it off the glass and put it in a cup
i saw it flopping like a nudi

then the antennae confirmed it for me
D. nigra is a good guess - OP, does the critter have a little, bushy "tail" on the side opposite the antennae?
tail at the end or by the antennae
 
yes i know that
my first though when i say it on the glass was holy moly. thats a big flat worm
but once i took it off the glass and put it in a cup
i saw it flopping like a nudi

then the antennae confirmed it for me

tail at the end or by the antennae
The end of the body on the far side away from the antennae.

Edit: To add, they sometimes shrink it down pretty intensively, so it may basically look like a decent-sized, circular crater.
 
no bushy tail but googled it
look like it without the tail

are they reef safe

will they nuke the tank if they die
If it doesn't have the "tail" (or the "ball" or "crater" where the "tail" should go), then it's a different critter (and probably distantly related).

D. nigra would be reef-safe, as it only eats highly specific sponges - it would inevitably starve in our tanks.

It wouldn't nuke a tank, but it could raise nutrients if it's big enough/in a small enough tank.
 
If it doesn't have the "tail" (or the "ball" or "crater" where the "tail" should go), then it's a different critter (and probably distantly related).

D. nigra would be reef-safe, as it only eats highly specific sponges - it would inevitably starve in our tanks.

It wouldn't nuke a tank, but it could raise nutrients if it's big enough/in a small enough tank.
got 700 gallons so i should be ok
surprised i missed it in the dip if it came in recently
thanks for your help
i hate to just kill it but if its only going to strage to death and die
 
i was wrong it does have a bushy tail

you are 100% correct. it has a bushy tail

so it only eat certain types of sponges or all sponges
It will most likely only eat a handful (like 1-4) different specific species of sponges - it won't eat all sponges.
 
dang thatlooks identical to a elephant slug, but considering it has those 2 ears it has to be a nudi/slug
 

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