Is that not like keeping brackish water fish? Or is the salinity a lot lower. I am assuming it is way lower but I have to askinfinity.
All of my tanks always have 1 Tablespoon of salt for every 5 gallons of water, 24/7, 365 and it is replaced after WCs so figure out a way to keep track of how much water volume you remove during WCs so you know how much to add back into it