might want to check your hydrometer to confirm that reading. Red Sea fish would do nicely with that....I think 1.028 is natural for them.
Take a sample to the LFS and see if they test it the same. My Hydrometer just went bad and was reading 1.030, but really it was 1.025
....I accidentally freaked out and did 2 water changes and dropped my SG to 1.022.
I have since bought a couple new hydrometers.
Anyone have a good preference for a refractometer???