Mollies can tolerate FW, BW and SW. No, the high salinity level will not kill them. I have not tried the salinity level yet as a factor of productivity rate so I cannot answer directly that SW will help them produce faster than FW although in theory, it could be the same with FW.mundegus;2030561; said:i would expect it would kill them, would it not? they surely wouldnt last long would they?