The pH is low, but that's OK for a cycling tank.
You might want to raise your salinity to 1.024 or 1.025. You can do that by topping off with saltwater instead of freshwater.
Right now, you should be testing for ammonia and nitrites, to see where you are in the cycle. Ammonia and nitrite should both spike, then drop to zero over the course of the cycle.
Don't bother testing for nitrates until your ammonia and nitrites drop to zero, as those can skew your nitrate test.