The whole idea of Reef-Resh is to create a low nutrient environment that your SPS and other corals can survive in. Keeping your other parameters in check just makes sense.
If you maintain these:
SG:
1.023 - 1.024 kg/m3
Temp:
79 - 81˚F
pH:
7.9 - 8.3
Ca:
420 - 450 ppm
Mg
1300 - 1400 ppm
dKH:
8 - 10
It dosen't automatically guarantee success. There are quite a few more peices to the puzzle.
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