I've noticed that my krib changes his pattern from night to day. During the day he has the regular horizontal stripe across his body, but at night when I turn the tank light off and come back after a little while that stripe is gone and he now has several thick vertical stripes. If I leave the light in the room on for a minute his stripes quickly change back. I don't have a picture, because he is very skittish. He is not part of a breeding pair, so his colors (besides the stripe/stripes and the yellow on his fins) are pretty dull and he seems to be the alfa of my 25g. Does anyone have any insight into what his patterns mean? Thanks!