You got it! These are the surviving offspring of the original snails you bought. They will eventually get as large as the parents.
I have been seeing similar with my astreas.
Awesome, I think the only negative is that I see them in my external overflow box. Meaning, if the get large, could clog up the drains. May be have to start a relocation program
Thank for the spell check! We had that figured out on the 3rd post.
May I point out a separate post? “How about trying a small mini pimp to blow off rock” Now where to find a mini-pimp?