since this thread poses a very "Seeweed-like" question, we best focus on EXACTLY the kind of fish the hooded wonder himself, Seeweed, would be:
indisputably, he'd be this little fella, known as the "candirú":

this Seeweed-like fish swims up the kahks of humans, entering the end of the shaft and swimming on in....... where it does all sorts of damage, apparently......
indisputably, he'd be this little fella, known as the "candirú":
this Seeweed-like fish swims up the kahks of humans, entering the end of the shaft and swimming on in....... where it does all sorts of damage, apparently......