Things have been interesting over the last few days. One of the yellows and one of the oranges died. The Orange died first, and the lone orange tried hanging with both groups. He mainly ended up with the yellow ones. But it was still interesting, as the guppies still stuck together color wise.
I lost the yellow one yesterday. I couldn't find the body, then suddenly it popped up today. but things have been interesting in that one of the black ones has spent some time hanging with Yellow and Orange, but for the most part the Blacks are hanging together.
I guess that I would have to get a number of different colored ones to see what happens, but I think that I will stick with the ones that I have now.