slug, cucumber, or nudibranch?

[whiterose]

I found this snail looking creature in my tank that resembles a snail without a shell. It's about the length of a fingenail form top to bottom. I have read previous threads and I think it may be a sea slug, nudibranch, or sea cucumber. My question is, what is the difference between the three? If it's a cucumber, I want to get rid of it. I believe it came as a stowaway in my last live critter shipment. I want to know if there is a difference between the three or if the two are different names for sea cucumbers. Any ideas?

 

[viper_930]

They are different, but I don't know exactly how. :notsure: Can you give us more of a discription of what it is you have? What color, shape, stuff like that. A pic would be nice too.

 

[whiterose]

it does kinda like that, but it appears to be thinner and longer. Unfortunately I can't get a pic.

 

[reefmad]

i have one that looks like this one shown in above thread what is it and is it safe? for reef keeping?

 

[greatfullreefer]

Just a snail, totally safe i have many, no idea where they came from but i got lots i forget what they are called begins with strom or something :notsure: