I have 2 WCB polish in a pen with 2 GL polish. My Roos are GL and I would like to collect a few of the GL eggs for incubation. However, I have no real way of telling who is laying what egg and no place to put the WCB Polish to separate them. I CAN tell that two of them lay a rounder, white egg and two of them lay a slightly bigger,more elongated cream colored egg. Which do you think is laying which?