They can be fearful of new things. What about putting a plop of it on a piece of cardboard, and then tossing some dry crumble over it? How old are they? For the future, I recommend starting chicks on lots of different textures (always keeping nutrition in mind, of course) early on, so they don't get in a rut about their feed being a certain texture and in a certain dish. My flock will attack anything that i bring to them.