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.
Many fish can be kept as tank mates with the Kuhli Loach as long as precaution is taken not to include fish that are able to take them for a bite of food. In other words, don't keep fish that are big enough to eat them.