I have 2 almost 10 weeks old silkies I picked up locally when they were 3 weeks old. They almost always move around together and their diet is nearly identical. One of them always poops big pile of dark drier poop while the 2nd one poops smaller watery poop that is light brown in color which barely holds poop shape. 1st one is a bit more active and alert while 2nd one sits more often pretty much from the beginning. Should I be concerned about the big difference in poop consistency between these two or it is normal for two different chicks to poop so differently just because they are different chicks?