These guys came in on a plant I got a month or so ago.

At first, they all looked the same because they are babies. Now, there are obviously 2 different types.

My lights haven't came on yet, so here are some sub-par pictures.

1st type. There aren't very many of them in there. Maybe 5 total. I think they are Ramshorn (Snails on the left--2 of them...mating?):

2nd type. I couldn't find any pictures that resemble these. There are probably 10+ of them. They are twice as big as the first type: