Can someone ID this things my nephew went to the

[Tiburon_atx]

Beach n brought home this things next thing you know theyre in my tank....... I wanna know is they represent any danger to my fish

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[MarkusII]

Hello,

an anemone - something like an actina - Beadlet Anemone looks like the blue variant
http://www.reeflex.net/tiere/830_Actinia_equina.htm

normally no danger for our regular fish

regards

Markus