All right... what the heck is this?

[agro]

I've had this Fla rock in my tank for over a month and I'm still finding new stuff! This guy seems content to munch on the red algae. It's gross watching him eat, since he is translucent, and you can see his insides working...
What is it?

 

[sterling]

Why didn't any of my LR have cool stuff on it like that!!
Looks like some sort of nudibranch.

 

[harrysreef]

Looks nudibranch and an awesome one at that

 

[j21kickster]

woah - so it moves? if so then a type of slug- looks exactly like a species of Red Macro Algae

 

[tiffster]

what a cool little critter! I agree it looks like a nudi of some type, but I haven't a clue what. Very cool though, I think I will go take a double look at my red macro now!!!

 

[justinx]

IMO it looks like aplysia, or more commonly, sea squirt.

 

[agro]

Looks like aplysia is the winner! It is some sort of Sea Hare! I am in the process of setting up a refugium right now, so I will throw some of his algae in there when I do. Right now I have a culture of it growing in another tank.