What do you think this is?

[leanne]

I've got another freeby! It looks like a slug, moves like a slug and eats like a slug but it's black with psychadelic green circles on it. It's about 1/2 cm long. Not got a photo as my camera's resolution isn't good enough to get photos of something that small from a distance (ie the other side of the tank)

Anyone any ideas?

I also got the teeniest hermit crab - small enough for you to not to be able to see what colour its claws are...

 

[Teelie]

Possibly a Sea Cucumber?

 

[ste2k3]

could be a nudibranch or a flatworm.

nudi

flatworm

colour is variable, and flatworms don't all look that shape but its the best pic I could find.

I would say its a nudi from the description.

ste

 

[ostrow]

Since the tank is fairly new and the rock is fairly new, seems to me the odds are more on the flatworm side but that's just my pessimism about the rock suppliers...my guess is the hitchhiker is more likely bad than good. A pic is really needed to id the critter.

 

[ste2k3]

I would also say it is bad but don't get rid till we ID it. often, the preditor will look like its prey so does it blend in with any of the corals/

ste

 

[leanne]

It looks colourwise a teeny bit like the blue/green mushrooms... Will see if I can get a pic. Nothing has disappeared yet...