Roommate's goldfish has parasite that gives it seizures (small

Tiny parasite like thingy came out of my dead goldfish

[F] Detailed Poop [GIF]

May Thai Possessed By Alien Parasite

Whole lotta poop

Is this poop or parasite? If so, any suggestions on the remedy?

Help! Parasite ??

WTF is this parasite looking thing I found on my goldfish's head??

Help with stringy poop

Poop or rubber?

Missing scales from fighting or parasite or ?

!HELP! is he still safeable