What's growing on my ninja star snail?

[areohen]

One of my ninja star snails has white-ish hairs growing on the bottom of the shell. Looks like GHA but its white

sorry the picture is not the best

 

[SnazzyUrchin792]

The picture is so bad I can’t even find the snail.

 

[vetteguy53081]

One of my ninja star snails has white-ish hairs growing on the bottom of the shell. Looks like GHA but its white

sorry the picture is not the best

Please repost pic and assure the tank glass and camera lens are clean.
This is what we see:

 

[areohen]

Hope these are better pics

 

[ISpeakForTheSeas]

I'd guess those are hydroids.

 

[vetteguy53081]

Hope these are better pics

Colonial hydroids and should be scraped off outside the tank in a container of tank water before they further spread

 

[areohen]

thanks for the info