"Jellyfish" looking thing in my tank

bonolover

New Member
I have at least 5 of these "jellyfish" looking creatures in my tank. I was told on another BB that they were a hydroid in the medusa stage (make sense to anyone?). They don't swim around, they just glide around the rock and the tank glass. They're a translucent clear color and the body is shaped like a tulip as it opens and closes. I was told that they could actually sting. Anyone know what these really are? I tried to remove them tonight, but they move quickly inside the rock as soon as the flashlight goes on them. Any ideas?
 
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