Branching coraline algae? Something else?

[AngiGiles]

Not sure what this is on my Halloween hermit. It seems to be branching instead of spreading.

 

[WheatToast]

Benthic foraminifera. These are filter-feeding protozoans and are harmless. The fibers on the forams are their reticulopodia, which are used for feeding.

 

[AngiGiles]

Benthic foraminifera. These are filter-feeding protozoans and are harmless. The fibers on the forams are their reticulopodia, which are used for feeding.

Another free pet! Lol! How cool! Now I'll have to research, thank you for your reply!

 

[WheatToast]

Update?

 

[AngiGiles]

Update?

Stuff is still hanging out on my Halloween crabs shell, just looks cool.. doesn't seem to be an issue

 

[AngiGiles]

Update?

this morning with the lights on