Yes. That's totally normal. They eat a lot and grow very fast. I am always amazed by how much chicks eat. No matter how much food I buy ahead of time, I always end up running back to the feed store eventually.
a chick to feed daily ratio estimate. I am almost filling the feeder, a Lil Giant 3 pound feeder daily (there are 38 chicks in the run) and its empty by the next morning. I am just now adding some throw down scratch that is corn/grain mix as they are getting bigger and needs busy work. They are all about 6 to 7 weeks old.