Help...snail like creature on my rocks??

[theduncanator]

So I bought a cleaner shrimp the other day, and tonight I decided to shine a flashlight in my tank long after the lights go out to find him. (since my cleaner is in hide mode during the daytime and only really comes out at night, currently)
As I was looking for "shrimp daddy", something on one of the rocks caught my eye. As far as I can tell, it's a freakin slug! I have never seen this thing before and I'm assuming it is nocturnal and hitchhiked a ride into my tank. It appeared to be about a half an inch long with two little snail-like antenna/feeler thingys...
Anyways, should I be concerned? I know people use snails as clean-up crews so I was thinking maybe its not such a bad thing. But ya know, just wanted to make sure its not some kinda alien life form thats gonna bodysnatch my royal gramma, or something...my mind wanders

 

[flower]

Get some moon lights and then you can really freak out!
They are indeed slugs and they are in abundance. They are also very good to have...it is why it is calld live rock. The live creatures in and on the rock is what you want and need.

 

[renogaw]

not all slugs are wanted... it could be a nudibranch
but, most likely it is a stomatella snail.

 

[theduncanator]

Thanks for the help...I looked up nudibranch and stomatella slugs, and have come to the conclusion that it is definitely a stomatella slug