We recommend using Paracleanse to treat internal tapeworms, a problem that nearly all freshwater fish have when purchasing from a pet store. We use this on every fish we receive in our store and in my personal fish room. It has proven to be safe for even scaleless fish, snails, shrimp, fish fry, and plants. We recommend using an airstone in the aquarium when treating with Paracleanse.
I would definitely recommend adding these little guys to your tank. They are very playful and entertaining. My three were very healthy and quickly adjusted to my tank.