DEFINITELY DO NOT GO NEAR THESE, now there is a story:
My friend was having fun with his new rifle, then he jumped on one of his sarcos (he has 3 :D) and went underwater, one of these stupid creatures just pulled him OUT of the sarco and literally surrounded him, he killed them all but drowned, he was going to lose all his stuff, if you see these just kill them from land or DO NOT GO NEAR THEM
If a cnidaria killed my spino, boy i would be mad. i lost my sarco to cnidarias, a scare with my icthy with cnidarias, and almost got my megalceros killed by some. ( he is dead now D:) I kill any of these that i can. The dossier says that they are passive, but aggresive when approched, NO! as soon as i step in the water these attack, and they litterally don't move at all, they just sit there and chill until you or a tame steps in the water. one like=one prayer for my deceased sarco, Gatorade (you can find his story in sarco) and one member of the cnidaria hate club.