Is this a Pod

[eb_reef]

At first I thought this was a pod but now I'm not so sure. Does anyone know what this is?

 

[Crabs McJones]

Ghost Flatworm. Remove them, you can siphon them out when you do water changes or look into natural predators such as wrasses

 

[KJ]

Acoel flatworm.
https://www.google.com/search?q=aco...IMKHbAzBPkQ_AUIBigB#safe=off&tbm=isch&q=acoel