Just joined and am co-owner with my husband to 2 pairs of zebra finch. We had our first hatch of 3 chicks now 4 weeks old. One is a light dove grey more on the white side. The other two are one normal grey and one with white wings feathers. The father is a normal grey and the mother is a pied but with just white wing feathers. My first question is how long do I feed the chicks on their egg food mix? Thanks.