What are these on my glass?

[markrbdr]

They just started showing up within the past week. Thought is was salt spots or something. But under closer inspection something different I've never seen before.

 

[lapin]

maybe

Hitchhikers Guide to the Reef Tank

What is this on my glass? What is this in my rocks? What is this on my coral? What is this growing in my sump? What are these bugs?We see these questions often. I thought I would put together a small thread with some of the more common hitchhikers we are fairly sure to see and question in our...

forums.saltwaterfish.com

 

[Saltyreef]

Hydroids