I have some of those big babies. My females are larger than a coin half a dollar, my male is about quarter size. I had to seperate my females and male b/c they layed a clutch almost every day. I got tired of putting on my black cape and carring out the death sentence to the clutches.
Betta Creek trust me you will know the differnce between the pond snail eggs and the Giant Rams. The rams lay clutches the size of a wadded up tissue, none of those barely can see stuff, the eggs in side are the size of BB's. Within 76-78 degrees it will take them right at 2-3 weeks to fully develop, you will be able to see the tiny baby snails in the slimy sack. These snails are TUFF! I mean real tough, I had a clutch get sucked into my Emperor filter and I thought that it was a goner for sure, well 2 1/2 weeks later when I changed my media I had babies the size of a pencil eraser surviving on basically nothing.
I have been able to keep an amozon sword in there with them and they will bite little holes in it sometimes but not enough damage to even kill the leaf. I feed mine the snail jello with mac&cheese baby food(it has the highest calcium) They love it.
Good Luck with ya'lls!