mix the seeds with the pellets, but don't over fill the bowl, if they empty bowl as soon as you've put it in, wait till the next meal time (if you have seeds left) and fill bowl a little bit again, keep doing this and after awhile, they should start eating or at least try the pellets
or you can moisten the pellets with a little juice,
they may not know the pellets are food
this can take some time, and it is trial and error, and maybe another method will work better with your birds, just keep trying, it took me a while to get nut to eat her pellets and this bowl outside her cage works the best for us
i feed nut harrisons adult fine, she will only eat them in a bowl that is outside of her cage, if i put the pellets into her fruit an veg, they get picked out or thrown out, infact in her cage and she does this?? she will even pick it out of mashed potatoe. i think she eats them as they are in easy reach when she is out of the cage, and she has had all the good stuff at the start of the day
lafebers do seeds with pellets in the balls, nuts other dry food and the balls are great for putting into toys etc so she can forage