I'm sorry it didn't work, but so nice that you went to all that trouble and effort to save a snail!
I wonder whether ordinary pond snails might be a better idea for the basement tank? They're adapted for the cold - the ones living in my outdoor goldfish pond survive even when the pond freezes over in winter - and they can reproduce enough to handle several hundred gallons of territory. You'd have to buy or breed a lot of mystery snails to cover that much ground.
I'd reach out to goldfish and pond keepers in your area, and get some normal pond snails as clean up crew I'm sure most would be happy to give you a bunch, I certainly would if someone local wanted some, there are plenty in my pond.
I wonder whether ordinary pond snails might be a better idea for the basement tank? They're adapted for the cold - the ones living in my outdoor goldfish pond survive even when the pond freezes over in winter - and they can reproduce enough to handle several hundred gallons of territory. You'd have to buy or breed a lot of mystery snails to cover that much ground.
I'd reach out to goldfish and pond keepers in your area, and get some normal pond snails as clean up crew I'm sure most would be happy to give you a bunch, I certainly would if someone local wanted some, there are plenty in my pond.