help weird thing in tank !?

[Miss cruz]

Hey i wash just watching the tank as i saw this thing on the rock i got such a quick glance at it but hows ut got in there an what is it !! It went into the hole in the rock before i got to see it properly but it was white it slitherd but didnt look long enough to be a slug it was about the size of a wood lauce anyone got any pics or ideas of what this could be ??

 

[Miss cruz]

Looked eveywhere cant find any pictures so i can find out what it is ahh

 

[Ricksreef]

Looked eveywhere cant find any pictures so i can find out what it is ahh

Check this site and see if you see a picture of it.http://www.chucksaddiction.com/hitchhikers.html