I.D please

[krp]

Can someone I.D. this ? I have about a half dozen on the front glass of the tank. They are about the size of a pin head.

 

[bigarn]

Hydroid jellyfish.

 

[mr_bill]

looks like a hydroid jellyfish

 

[bigarn]

Bam! .... 2 right answers at the same time.

 

[krp]

Thanks for the replies. Are they good or bad?

 

[bigarn]

They're pretty much harmless and tend to dissapear on their own.

 

[krp]

Thanks