What could this be

[Itd59]

Hi

Can anyone suggest what this could be please?
It was flat and quite wide and sliding along sand

Thank you

 

[Reeflix]

Nudibranch? I am not certain on that though

 

[ISpeakForTheSeas]

May need better pics to tell for sure, but possibly a Leopard Polyclad Flatworm.

 

[Itd59]

May need better pics to tell for sure, but possibly a Leopard Polyclad Flatworm.

Thank you I just looked this up it is definitely this. Are these dangerous?

 

[ISpeakForTheSeas]

Thank you I just looked this up it is definitely this. Are these dangerous?

Assuming you have a Pericelis tectivorum worm here (which is what it looks like to me), it would be dangerous to snails for sure, and possibly worms and small crustaceans (like tiny crabs, shrimp, pods, etc.) as well - they shouldn't cause any problems for your fish or corals though.

It could be cool in it's own little tank if you want to offer it snails regularly.