ID on these things on the back of a snail?

[benmed]

any idea what this white fluffy stuff is on the back of a snail? Hasnt seemed to spread…. yet

 

[EeyoreIsMySpiritAnimal]

Hydroids

 

[benmed]

sounds ominous. Is that bad?should I take him out before they spread?

 

[EeyoreIsMySpiritAnimal]

What is that!! A R2R guide to common new tank hitchhikers.

One of the greatest things about starting a reef tank is getting your live rock in and admiring all the diversity within it. The rock comes to life different creatures. This is a guide that I, along with a very well known critter identifier @KJ , have put together for the new reefer on what...

www.reef2reef.com