Chizzle, try this instead. Theres no need to crush the pellets and no need to starve him either.
Your fish is probably eating bloodworms. Thaw a couple cubes of bw in a cup (or run water over them to speed it up) then put some of the melted bw on top of the pellet. Drop the pellet with the melted bw on top into the tank and your fish will swallow all of it bc all he sees are the bloodworms. Keep doing this and gradually decrease the amount of bw until you put none on top.
This teaches your fish to recognize pellets (and things you drop into the tank) as food and gets them used to the taste of pellets. I use massivore pieces bc it smells the strongest and makes fish grow fast ime. Plus its color is similar to bw so they can't distinguish it and makes it more likely they'll swallow all of it.
If you crush the pellets and mix with bw and pour it in, the fish is likely to just pick out the worms and leave the pellets alone. Don't need to starve them because I always use this method and its safer and faster than starving.