My chicks will be 3 weeks this Wednesday. I would like to start giving them some sand/ or grit. I had asked at Agway and was told that the grit they sold was to big for them. I bought sand, but it is" washed play sand" ( I have no clue as to what washed sand means). Is that to fine to give them, or should I just get a regular bag of sand? My intentions for giving them sand/grit is that I want to put them in a pen to play in the grass while I am outside with them, so I was figuring if they eat a bug or something they would need sand/grit. Also since they are turning 3 weeks, I figured I'd incorporate some fruits and veggies into their diet. I am new to having chickens, and have a million questions on raising them, but I figure I am doing something right because all 6 of the girls seem happy, they run around, play and they keep growing -LOL!!!