what is this?

[valasaraptor]

was goin through sum pics and found this i have 2 itty bitty 1s on my glass any clues? are they bad?

 

[ccCapt]

That is a hydroid jellyfish.

 

[coffeebean]

Do you have any brittlestars in your tank? Could be a couple of them have been having some fun after lights out...
Site won't let me delete after CC posted one minute before me.

 

[Bifferwine]

+1 ccCapt. They tend to go away on their own and not live long in our systems.

 

[valasaraptor]

ok good,i ddnt kno if they were good or bad