Id please

Looks like this?
http://www.microscopy-uk.org.uk/mag/...98/obelia.html




"wozzer" wrote in message
...
Can anyone please tell me what this is:

http://www.smudgeme.com/bug/index.htm

there semi transparent and either sit on the side of the glass or can be
seen swimming upwards in a jerky jellyfish manner towards the light. When
they reach the surface they stop sink a few inches and swim again.

They dont seem to be bothering anything and the fish are ignoring them

Thanks in advance

Warren