Some of my endlers take on a grayish color when they are very small. As they get larger I don't see that color any more so it seems normal to me. I have so many that I don't actually know which ones become which ones over days or weeks. All I can do is judge based on what I have at each size and the grayish color only seems to be among the very smallest that are less than 1 cm long. By the time the are 1.5 cm I no longer see much gray color in any.