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

Bichir eating goldfish (and some veggies)

Fish and Goldfish

Any idea what is wrong with my fish?

My fish is struggling to swim and is stuck upside down

Sick fish

7 days after white spot fish are looking loads better and plants

Sick Fish

New to gold world. Erratic fish

mystery fish illness

Pls help, bully fish

What is this on my fish’s tail fin??