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A refractometerHow are you checking silently?
Did you calibrate it? I've found refractometers to be unreliable. Have you asked your lfs what salinity they run? I only ask because that seems really low.A refractometer
Yes it’s calibrated, and I tried it on 3 different ones.Did you calibrate it? I've found refractometers to be unreliable. Have you asked your lfs what salinity they run? I only ask because that seems really low.
Just put the water in last nightHow long has the tank been running?
Ok thank youYou buy pre-mixed salt from the LFS? I haven't seen that before.
To answer your question, in a fresh tank with no occupants you can add straight up salt incrementally until you reach 1.026.
In the case where you have living creatures in the tank you would just use pre-mixed saltwater instead of RODI until the proper level is reached and then switch the ATO back to RODI.
I wouldn't add coral until the water is proper which is an easy fix.