I have three platies and three guppies, and they established groups based on color. One guppy is red, and he hangs out all the time with my platies. The other two are blue, and they don't want to have anything to do with the red clique and usually hang out together in a different corner. I used to have a differently colored, but still blue, guppy before, he behaved the same. Anybody experienced this? Just curious!