depending on where it comes from it can be harmful  and VERY hard to get rid of.
I have a system that I used to have upside down jellyfish, now hydroids are everywhere tank raised upside down jellyfish LOL
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Clownfish Collection: Normal Ocellaris, Black Ocellaris, Stubby Ocellaris, Tequillia Sunrise Ocellaris,
Red Sea, Black Saddleback, Brown Camel, Orange Fin, Melanistic Clarkii, Common Clarkii, True Percula, True Picassco, Pink Skunk, Orange Skunk, Maldives Clown, TRUE Sebae clown, Akin Clown, Gold Striped Maroon, White Striped Maroon, Latezonatus
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