If you want a pellet they will eat...get Hikari Marine -A- pellets. They are a slow sinkin pellet. Pikes generally don't like floating foods, so sinkin is better. Seein other fish eat will help them try it as well...
. Hikari Sinkin Carnivourus pellets are great as well. Definately get them on mysis shrimp if you can...
Way better than brine. Ask your LFS to get in Piscine Energetics Mysis Shrimp. The best brand available...100%