I have 2 of these little horned nerites.
My TDS is currently 167 and never goes higher than 220. My tap water has a kh of around 2 and a gh of around 2 also. I use tap water for water changes but do have a lot of seiryu stone which may add to the mineral content slightly (don't know tank kh as don't test) but wouldn't guess too much as TDS is low. I inject co2 which depresses ph to the low 6's during the photoperiod, but rises to above ph7 after the photoperiod.
Whilst both snails are active and seemingly ok, they havnt grown much or developed horns which I'm guessing is down to the struggle of obtaining the necessary elements for shell development. Ramshorns do ok and reproduce, but don't have a nice sheen to their shells.
Nerites can survive in high tech soft water tanks, but don't thrive IMO.
Cheerio,
Ady.