Amazing thingies!

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Recently i watched a video of one of my friends. The video focuses on fishes and other marine lifes. I cant believe what i saw because it was my first time. I saw sparky shiny FISHES.[Jellyfishes and many more] So i wonder if Sirene`s really exist`s? I know this is a Child Stuff question but i am just curious if there is some kind of marine life like Sirene? Or anything awesome or so good to be true. Do you also wonder about it? Want to share some rare awesome Fish pictures or Informations? All of your posts will be greatly appreciated. Just be sure its legal:)