It appears that my Briggs have taken a vow of celibacy. I haven't even seen any mounting yet! There are about 5 that are ping pong ball sized and 15 in total so I doubt that it's all male or all female. You'd think that based on reputation there'd be Roman orgies all the time! The tank is slightly overfed with 3 inches between the top of the tank to the water line. The tank is 82F. I've read other threads and tried to follow their advice (like increased temps), so maybe I'm looking for sympathy as much as advice.