Sea Slugs

[Kabong]

LOL gotta love the newbs.

As for the question ill second Albert's opinion.
Nudi's are a waste of your money. They will just end up dying.
Even the ones that we use to eliminate other pests in our tanks aren't even usually worth it.
They usually starve before they can completely take care of the pests (flatworms, Apstasia)
I've heard that lettuce nudi's are the exception to the rule but I could be wrong.