A while ago, once my tank was all set, I had some guppies, zebra danios, white clouds and different bottom feeders. All of them but the bottom feeders seemed to mingle with one another. Sometimes at the top of the tank, sometimes in the middle.
I gave away the danios because I didn't like the way they were chasing everything. After I gave them away, the white cloud mountain minnows went down to the bottom and their colour faded a bit. They then spent all their time mingling with the chain loaches. lol The guppies alone inhabit the top of the tank.
Recently a few of the guppies died. I bought a few more guppies so the numbers are about the same. But now some of the white clouds have their colour back and are all over the tank again.
Anyone ever heard of this??