Jellyfish!?!?!?!?!

[Zoaelite]

Originally Posted by justinl

well... technically any crustacean larvae are called nauplii tony

hydroids and cnidarians can have what is known as a medusa stage. the medusa looks like what most people know as a jelly; hydroid medusae are called hydromedusae and look very similar but have a few mostly anatomical differences. All of them have a polyp stage. medusae are supposed to settle and make a new polyp but I highly doubt that they can accomplish this in captivity unless special precautions are taken.

in the end though the result is the same; it will get eaten or chopped in a pump, either way it will die without causing any harm.

If I'm correct the phylum cnidaria also contains Anthozoa (The corals in our tanks) which do not have a medusa stage. As for the not causing harm thing, im sure 95% of the cnidarian species in our tanks are harmless but I have seen Jellyfish completley wipe out a sea horse tank.
Levi