Jellyfish? ID needed

[thejrc]

Alright so I'm mucking around in my sump today and when I stood back to look at how things were going I noticed this little dude boppin around all over. He moves exactly like a jelly, and looks like an itty bitty jelly. he's no larger than my pinkie nail. Eventually he bopped down onto a rock and dissapeared.

Chucks addiction has photos close to it at

http://home2.pacific.net.ph/%7Esweetyummy42/hitchodds.html
that say it's a Cassiopeia andromeda but every other hit on the Cassiopeia andromeda suggests that I should have a larger and more colorful adult somewhere one would assume... I'm having a tough time finding info in the least....

So I ask.... what is this thing? (picture of it free swimming moving sideways)

 

[greenbean36191]

The picture is way too small to tell anything, but if it really is a juvenile jellyfish it would have budded off of a polyp somewhere on your liverock, not come from an adult. You're also likely to see more if that's the case since the polyp will continue to crank out juvenile jellies.

 

[chrisqueenz]

It's kind of a small pic..

 

[thejrc]

its kind of a small creature, about half the size of my pinkie nail

 

[davidryder]

A better pic might help... do you have access to a better camera?

 

[thejrc]

not really, but after studying up and dropping one of these guys under my dissection scope it definately is a jelly! The andromeda listed on chucks addiction even!

From reading more apparently they dont have nematocysts long enough to penetrate human skin so no worries there, they're supposedly hard to get rid of but they're definately isolated to my refugium so I think I'll let em be. In fact they seem to be isolated to only one rock in the refugium! All 60 of em.

They seem real good at catching waste foods so I'm happy with that. I'll play devils advocate and keep the lot of em around.

 

[greenbean36191]

From reading more apparently they dont have nematocysts long enough to penetrate human skin so no worries there

Oh yes they do. My g/f at the time had the joy of sitting on one while she was gearing up for a dive and I made fun of her until I caught one on the back of the hand. :lol: It's not a bad sting though.

 

[thejrc]

he he not sure about sitting on a jelly, thats simply got to suck

 

[Chad Vossen]

iv had these in my tank too. i felt it was strange to find them after not adding anything to the tank for months. i simply accepted them as larval hydroids, which i had many of. i only ever noticed them in the fuge area.

 

[Ellie N]

Cassiopea have more of an irritating/ichy sting but if you just move them slowly they usually wont sting you. These guys are masters of hitching a ride and populating a new tank. We acually have a bit of a hard time keeping them out of our other tropical jelly tanks. Little buggers.