ID please - jellyfish type hitchhiker

[DS204]

Anyone know what this is? This popped up today in my small, observation tank. No new corals in 6+ months, 1 new fish added about 1 month ago.

Any information would be helpful, thank-you!

 

[vetteguy53081]

Its one of two things:
Aptasia which will do this but man, has the habits of a jelly fish.

here is baby jellyfish

 

[D.WhiteShark]

looks like a hydroid to me. I had a bunch of them... this particular type seems to "go away" over time

 

[Crabs McJones]

Hydroid. Pretty cool find. But not something I would keep

 

[vetteguy53081]

Duh- droid !!
Unwelcomed in my tanks

 

[DS204]

OK thanks for the info. It's been removed and I'll keep my eyes peeled for more.