basically everything I read on it said fish like 1.020 to 1.024. even just googling preferred salinity for Clownfish shows about that range. I know coral want 1.026, so what I'm doing is when I'm doing water changes (every other week or so) I'm adding water at 1.026 so it will slowly raise over the next few months. its just what I read, I spoke with a friend of mine who actually has a degree in aquarium science who said lower salinity helps fish gills function better. idk if its true, I don't want to put this out there are true, its just what I read and what I was told, so that was my plan on salinity. my fish seem happy so far, so I'm not going to change up the plan too much at this point. typically treating for disease I think you want it a lot lower. like 12-16ppt, not 30 instead of 35