I had went to Petco to try to find some parakeet grit to give to my 1 month old chicks, but the only kind I found was called Hi-Cal Grit or something like that because it has a lot of calcium in it. Is that ok? Is it too much calcium? Do they even need grit at that age? BTW...here's the ingredients in it from Petco's website: Ingredients Granite grit, oyster shell, calcium carbonate, dicalcium phosphate, salt, charcoal, mineral oil, orange oil, zinc oxide, manganous oxide, ferrous carbonate, copper oxide, calcium iodate, cobalt carbonate. Guaranteed Analysis Calcium (min.) 17.5%, calcium (max.) 21%, phosphorous (min.) 0.25%, salt (min.) 2%, salt (max.) 3%.