Most people who get the hepatitis B vaccine do not have problems. Some may have mild problems, including soreness where the shot was given and fever. Acetaminophen (eg, Tylenol) is sometimes given to reduce pain and fever that may occur after getting a vaccine.
The Kuhli Loach, Pangio kuhlii, is a small eel like fish. It comes from Indonesia, Malaysia and Thailand. Other names include Coolie Loach, which is a clear miss-spelling of Kuhli; both these words are pronounced in the same way.
My black kuhli loach will eat almost anything. Loaches are bottom feeders so they aren't very picky. I feed mine fish flakes that my other fish didn't get to eat in the tank. They are very low maintenance and will perform the kuhli dance of joy.