I accidently left my DI water on too long in my tank and the salinity 1.20 what should I do? Should I do a water change real fast should I leave it? Thanks.
If you are in a time pinch and have the ability, I have raised salinity by putting salt in a fine filter sock in a moderate flow part of sump. Never in the tank. Warning, this is vastly less than ideal but can be done.
Just keep in mind that after a weeks worth of evaporation, if you top off with RO/Di water, you'll end up back with the low SG. You'll need to top off with saltwater. I'm sure you've already thought of this but I figured I'd remind you.