This many snails is a pain in the butt - they create a ton of waste, and while they do a decent job of keeping the tank clean, we have had to re-evaluate our filtering system. The baby snails have a date with the snail tank at our
LFS - their growth is getting slightly out of hand. They are so fun, though.
We are now using an under-gravel filter, and doing a 25-50%
water change once a week and a full on tank empty and scrub and vacuum every 1.5-2 weeks so the snail poo doesn't compromise the water quality (we currently have a good system figured out in which we are able to clean while still keeping the integrity of the water and its parameters, eliminating even a mini-cycle). Swimmer has no idea how spoiled he is.
In the meanwhile, we have had to move our female to a separate tank. She keeps getting by the divider, and this past week he tore her fins up pretty badly - she is now in her own tank, and seems slightly unhappy about it - but it's for her own good.