I use the Parakeet grit from Wal Mart & have not had any problems with it. I also did not start giving mine treats till they were almost 2.5 weeks old. At first they got some yogurt mixed with their crumbles & then scrambled eggs. Once I knew they handled that fine then they got some very small earth worms (the longer ones I actually cut cut smaller for them). Once I started this I gave them the parakeet grit in a large tupperware container & let them have at it for a few hours. I only let them have it for a few hours a day now because if I leave it in there all the time they kick it all out & poop in it.