Tiny jellies? Friend or Foe?

[tanyashankles]

What the heck.. Are these guys normal to pop up outta nowhere? They look like babies. They are only a few mm in diameter, and are brownish.. But they 'pump' or pulse constantly to keep from getting carried away in the current. Thanks in advance! Tanya

 

[mollymonticello]

Hydroids! Fascinating creatures. Can you get a pic? I know they are small...

 

[mollymonticello]

Doryarlin on another forum got some great pics of these

<img src="http://i121.photobucket.com/albums/o230/dorymarlin955/DSCI0010.jpg">
http://s121.photobucket.com/albums/o230/dorymarlin955/?action=view&current=DSCI0010.jpg