My hen hatched out her first clutch of eggs on the coop floor in the corner. There was 13 eggs and 11 hatched, (all hatched on day 21) On the next day she left the nest and moved chicks to the other side of the coop. She left the other 2 eggs there. Later that same aftyernoon I went to check on them and the 2 eggs that were left were covered with black specks. I actually thought it was fly poop till I picked one up and all the specks were moving. They were too small to tell what it was. I discarded the two eggs cause she hadn't set on them all day anyway. Does this sound like mites to anyone??????? I bought sevin dust 5% but haven't used it yet. Is it safe for the new chicks to be around???? I would like to take all shavings out of coop and dust everything down. Is this ok?? The hen and chicks are sleeping in a corner on the ground of the coop so they would be right in the Sevin dust. Sorry so long. Please help!! Appreciated