good to know, they are showing way more agression now and defending the heck out of the rock structure. lets see how much longer before i start noticing any fry. i hope they even pair'd up.. when i bought them i kept my eye out for 2 that swam around together already but none were already breeding, i noticed the pinkish orangish belly so i figured thats the female, then the male was much larger and had more of a forehead then the female, he's always flaring his gills at the piranhas but they take turns swimming around to check there surroundings. but they have dug up some gravel like he's trying to hide something, hope to see some babies pretty soon.