Heh...I was referring to inverts mostly..I remember there was a time long ago..when everything I bought and added into my 2 footer died...then finally found out the reason..my s.g hydrometer was faulty..got a new one..and my tank s.g was 1.026! the introduced inverts were in s.g in 1.020s. I remember even caulerpa went asexual and melted after being introduced into such water.
Anyway Rav..I keep my s.g between 1.022-1.024 for the most time..works fine for me..