So my male fancy Guppy just recently lost a piece of his tail, he lives in a 3.5-4 gallon tank with a female Guppy, 2 danio glos, and a small female betta. The missing piece looked like a clean cut to me, so I thought one of them was picking on him and ripped a piece of tail off, instead of a sickness. I knew it couldn’t be the betta because she’s very shy around the fish, I assumed it was one of the danios because they do a lot of rough play and chase each other around. So, I set up a 2 gallon tank with a filter and some Tetra Life Guard just in case, and I put the female Guppy in there to keep him some company. It has been about 2 days since then and they have been fine, but today I saw that the female was picking at the male’s body and his tail. Is this natural breeding/mating behavior or is she the one who cause the Guppy to lose a piece of his tail or is this a sickness?