There are many different pellets available on the market. Converting a bird to pellets may or may not take some time, tricks and patience, depending on the bird and if it likes the taste of the pellet you have bought. Begin conversion when you feel the bird is settling in nicely in your home. Try mixing a bit of pellets into the seed, adding a bit more pellets and less seed each day until you are no longer adding seed. Pellets can be softened with little water or fruit juice.
All birds have the potential to bite.
An adopted bird can come to you sweet and loving or disguised as a little, green terror. Fear, misunderstanding, poor, diet stress, molting and hormones can affect a bird's behavior. Hands frighten some birds. As painful as it can be, try to ignore the bite. The bird is waiting for your reaction.