Snail species,
Pond snails, which they say you're not supposed to have cuz they eat plants, but I've never had aproblem w/ that. small population
Ramshorn, just eat spot algae mostly, VERY prolific, Large population. These are the ones that get the ruthless treatment from time to time.
Some kinda Japanese trapdoor snails which were shipped to me in place of malaysian trumpets. I wanted trumpets to aerate the gravel, these are useless but i couln't just kill em (not yet anyway). If they are having babies, I can't tell yet, all the small ones in tank loo the same right now. There has beeen alot of "clutching and grabbing" amongst them so i assume breeding is going on.
Oddly enough, I only got 3 trumpet snails from 2 different online dealers, (supposedly they are very common to get in plant shipments) they are in another tank, no evidence of breeding there, possibly not enough to breed.