Definately, they do not afford the water of my shrimp tanks. I believe the water is too soft due the RO water and rain water I use.
In my fish tank - tap water - they look OK. So I moved most of them there, and to my mothers tank too.
Time to go hunting for this black / red mouth full fresh water nerite.
I collected some driftwoods in the brackish spot, let them sank for 3 days in a permangante solution, checked today, and found this little guy :
The shell is the size of the big thumbnail. This one was alive, almost healthy, unfortunately, 3 others were laying dead in the bottom... It looks happy in the fish tank.