Identification?

[Wildisme]

Just curious if anyone knows what this thing is. Some kind of slug? Just showed up one night in the tank. Its about 2-3" at this point.

Is it beneficial?

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[Wildisme]

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[Illinijoe]

Wth is that 2-3" out of nowhere

 

[Wildisme]

Wth is that 2-3" out of nowhere

Literally never seen it. Then one night I seen it on the glass. Next day it was gone. Showed back up a few days ago and now it's out daily. Seen it in the glass and on rock/coral now.

Me and my fiancé watch the tank all the time and never seen it until the other night about 2 weeks ago


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[cment]

Looks like some type of nudibranch...that thing is crazy! I would pull it out of the tank and put it in a bucket with a airstone and heater for the time being

 

[Wildisme]

It's been okay for the past few days. Doesn't seem to mess with anything.


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[madjoe]

Dude u guys r finding cool creatures hope it dont eat anything

 

[ttmanta]

If you end up pulling him I'll be happy to take him from you. I like the strange & unusual things.

 

[Illinijoe]

Literally never seen it. Then one night I seen it on the glass. Next day it was gone. Showed back up a few days ago and now it's out daily. Seen it in the glass and on rock/coral now.

Me and my fiancé watch the tank all the time and never seen it until the other night about 2 weeks ago


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Amazing what hides in rock. Especially at that size

 

[jrpark22000]

Try a google image search for "frilled" or "frilly sea slug" or "sea hare." Several images came up that look similar but your blue images made ID difficult.

 

[jrpark22000]

Here's another way to search;

https://www.google.com/search?q=sit...ved=0ahUKEwi_wdqI4dbPAhXFTSYKHYGNDrcQ_AUIBigB

It's a google image search "site:www.seaslugforum.net"

Essentially it links to this webpage, but you'd have to click on every link until you find something similar. http://www.seaslugforum.net/specieslist.htm