What do you think of these snails?

[Bifferwine]

I dont care for some many snails per gallon rule.
You want just enough to keep the tank clean.Some tanks,5 or 6 snails might do the trick,in others,it might 40 or 50.Just depends on how much algae needs to be taken care of.

This is true. Every tank is different. I have maybe 5 snails in my 90, and I don't need a cleaner crew larger than that. The smart thing to do is to add only a few snails at a time, as needed. Of course that's hard to do if you buy them online and have to pay for shipping.