I currently have at least 5 baby guppies, 1 adult guppy, and 2 neon tetras. And well, when my last guppy died i noticed he had marks on his body. I recently replaced my last cave that was in my tank cuz the previous one had a piece that was broken off. However, based on that death I don’t think it was the caves fault. Whenever I only have 1 guppy in the tank she does very well. Currently contemplating whether it was aggression between the fish or maybe the cave doesn’t have enough smooth edges? I have images of the two hides i have in the tank.