ID please

[Callie]

Hi Dr Ron,
Found 2 of these strange things in my dwarf seahorse tank. At first glance I thought they were "grapes" from some grape caulerpa, then they started moving. They moved similar to a jellyfish by pumping their sack like body. They are the same green color as grape caulerpa.
http://www.users.qwest.net/~mkm4/awth.html

Kathy

[Pinecone_Jeff]

Wow! Neato pics! I have an old microscope that belonged to my father-in-law. I've been meaning to take it out and suck up some water from just above and below my sand bed to see what's in there.

[rshimek]

Hi Kathy,

They are perfectly good little hydroid jellyfish, probably of a species similar to [i]Euphysa[i]. They are asexually budded off some of the hydroids in your tank. They may well get big enough to kill and eat sea horse babies.

Very nice pics. I would like to use them on my website's "oddiities" page. If you would allow this, please email the jpgs with a specific statement of permission to rshimek@imt.net.

:D