I just set up a tank a week and a half ago and I've kept my two snails in there since I set it up. I also put four plants in my tank and didn't get the annoying cone snails out as well as I thought I did.
I've got Acroloxus lacustris
(maybe 10-20 of them) a couple of Nemotodes
and some smaller ones that I can't identify but they're super small and if/when they get bigger I'll see what they are.
The part that worries me is that I have found something new on the glass of my tank. They look like translucent flowers that are somewhat attached to the walls. I don't have a camera high res enough to get a good shot of them. There are a couple dozen of them total (but I can't count for the life of me so there may be up to 200).
Anyone see these before?