Need ID help of critter.

[Pakratt]

My son took this picture last night while lights were out. It's the only picture so far if it. We haven't added anything to the tank in a couple weeks. We've never seen it before last night. Should be worried about it, try to find it again and remove it?

 

[Maho.B]

Looks like cowrie to me. If so, they are useful members of the CUC I believe

 

[Privateye]

+1 for cowrie.

Some are great (e.g. money cowrie) but most are not reef safe (e.g. tiger cowrie). I'm not sure which species you have, but it's not either of those.

 

[BryanM]

+2 cowrie

 

[martin.a]

It is a cowrie. To identify, next time you see it, touch it gently. I will retract its mantle and show the shell. Take a photo and post. Cowries are usually nocturnal, best to look for them an hour or so after dark.

 

[Pakratt]

Got a picture of it last night again after gently touching a couple times.