Ammonia shouldn't get too high while using TSS, that's kind of the point of it, it keeps all the levels down to a tolerable level, but I think if you see they are getting too high than you can do a water change, I'll have to look that up though.
Yeah priority is fine! That's what my snails were sent from, I'm kind of cheap when it comes to shipping.....just remember to acclimate them all the same as you would a fish, the pH level will probably be different than theirs. I acclimated for half an hour and they were fine :)
Yeah that does suck there's no "local" store, we just had one of our locals start back up again this week after going out of business for a while back in February. So this makes 7 stores I can choose Betta's from lol, guess that's the good thing about living in a small state :D
Leopards: 1:4 Hawkeye, Luna, Astrael, Dorian, Cullen