HOLY! ?? What is this???

[RandyRhoads]

I found a couple of these small slug looking things on some base rock in my saltwater tank, I poked one and it started flashing bright neon colors?! What are these things?? The one I poked maybe had a shell, but it looked similiar to the pics of these other ones I took.

I also found this thing growing off my LR, looks like a button with a stick growing out of the middle. Anemone or tube worm?

 

[MacDracor]

Stomatella Varia. Think of it as half slug/half snail. Harmless, excellent cleaners, will breed in the tank. The last one, I don't recall the name, but it's a type of worm that secretes a tube. It feeds by throwing out a long thin, nearly invisible sticky string and then eating whatever sticks to it.

 

[RandyRhoads]

Thank you! I also found a clam and in a few places there is this weird white slimey puffy thigns on my LR. Don't know what it is, it's not snail eggs. All harmless for a FOWLR lion/snowflake eel?

 

[MacDracor]

Little clam shaped like a mussel, stuck to the rock? Had one. Lasted a couple months. Now, I have small oysters growing on my torch's corallite. White puffy things most likely sponge. Most common is the pineapple sponge, which is shaped like a pineapple. Very creatively named. But there are too many kinds of sponge to even name them all, much less be able to tell apart.
You're unlikely to come across a hitchhiker that could hurt a lion or an eel. Except perhaps a mantis shrimp, and then only once it gets big. But if you had one of those, you'd probably know it by now. LOL