What is this on my snail ??!

[ivanzlemus]

I bought a couple snails for my nano that’s been set up with no coral for a few months , I seen something glowing on my snail , what is it ?

 

[Red_Beard]

Can you show us a pic with more white light? Hard to see detail with all the blue.

 

[bluemon]

Some kind of encrusting algae. Some of them fluoresce when exposed to air and re wetted