My ph is between 7.0 and 7.1 which is controlled by a ph controller. Essentially, they would be going into a heavily planted 55 gallon tank that has mystery snails, ramshorns, pond snails, and red cherry shrimp in it right now, along with a couple of royal farlowella fry. I know that 7.0 - 7.1 isn't optimal for mystery snails, but they have been in there for 2 months now and I haven't seen any pitting of the shells. In the next month or so, I'll be getting a 10 gallon for the mystery snail babies, so I'm thinking about getting another 10 gallon for the CRS. I'd like a 20 long for the CRS, but I think my wife might kill me.