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.
Kuhli loaches are not a demanding fish, and will thrive in a well maintained 20 gallon tank. While many people attempt to keep them in smaller aquariums, a group of well fed kuhli loaches will quickly outgrow anything smaller than 20 gallons.