They only need a little bit of grit every couple so often, which is provided in their cuttlebone. If you don't give them cuttlebone, and use something else for their calcium(ex. Manu, lava rock), then yes a touch of grit ever few months even ever year is fine, is needed. They do not need it everyday or anything since it takes them along time to digest it. And when it builds up, that's when the problems occur. so if you give them cuttlebone then know you don't need it at all. Unless of course your avian vet says otherwise.