my salinity level has went down from a 1.018 to a 1.016 because i just added some more purified water to my tank,can some1 please tell me wut can i do and if its good or not good at the level i got it in,becuz i remember i went to my LFS and the owner told me that many people will say itz too low but he says its a good water level cuz he says he has his SW fish tank at that level and that parasites cant live in that water level but fish can.