My petsmart has some tinyyyyy fish too. When I got my Sully, he honestly looked more like a guppy than a betta. It seems like it's mostly the HM's and Crowntails at my store that are coming in super tiny. I'm not sure why it keeps happening, but it's really sad, you can tell that some of them are really weak, and when they get there the pellets that the employees have to feed them are often too big for their little mouths.
My Current bettas:
Sullivan- Orange rose tail halfmoon male
Daisy- Mustard Gas (black and yellow) veil tail female
Milton- Teal butterfly halfmoon male (mom's betta)
DFTBA to nerdfighters working to decrease world suck!