Jellyfish good or bad?

[e1v4n]

Hey guys,

I've been noticing Jellyfishes in the tank one or 2 times before during the tanks life.
Today I saw this are they bad? If so how do I get rid of them?

 

[reefah]

could be hydriods in medusa stage.. tbh I think they would eventually die off due to powerheads/filtration etc but my girlfriend would say oooooo keep them! so cuuute! i dont think theyre good but also not terribly bad... they'll go eventually......eventually..... curious what others have to say OR it could be jellyfish

 

[ScubaFish802]

I've seen similar posts before, but after finding them I don't hear people post back, so I would assume they probably disappear at some point