If you find the Red Sea forums they will say that it might vary as the salt settles during shipment over time
This can especially be a problem with the 5 gallon buckets regardless of brand. Rolling them around before use can help redistribute the ingredients.
From Red Sea
Never mix salt in an aquarium containing animals Always use clean,
non-toxic utensils.
1. Prepare the quantities of salt and water for the
desired salinity according to the chart.
2. Use reverse osmosis (RO) water at approximately
20°C/68°F. Always add the salt to the water.
3. Mix vigorously (without aeration) for 0.5 - 2 hours,
until all of the salt is dissolved and pH has stabilized
to 8.2-8.4. DO NOT mix for more than 4 hours
4. Raise the water temp to 25°C/77°F and measure the s.g./
salinity with an accurate hydrometer/ refractometer. Add salt
or water as necessary to achieve the desired parameters.
Aquarium type S.G. at 25°C/77°F Salinity Dose
Fish, non-coral inverts 1.021 30.6 ppt 33.4 g/l (1.4 lb/5 US gal)
Soft/LPS corals 1.023 33.0 ppt 36.0 g/l (1.5 lb/5 US gal)
SPS/Giant clams 1.025 35.0 ppt 38.2 g/l (1.6 lb/5 US gal)
Recommended salinities for different aquarium types
Element levels at different salinities
Salinity pH Alk (°dKH) Ca (mg/l) Mg (mg/l) K (mg/l)
30.6 ppt 8.2 – 8.4 11.3 - 11.7 400 - 420 1185 - 1245 340 - 360
33.0 ppt 8.2 – 8.4 11.8 – 12.2 430 - 450 1280 - 1340 370 - 390
35.0 ppt 8.2 – 8.4 12.3 - 12.7 455 - 475 1360 - 1420 390 - 410
* All parameters are based on mixing at least 334 g / 12 oz of Coral Pro Salt
with RO water.
I agree with
@Squatch XXL on checking salt mix etc. IMO RSS is a PITA to mess with. Good product? Very likley, but I am a mix a store guy. I believe RSS wants to be added to your tank within 12 hours of mixing.
I had been using Reef Crystals but I have switched to Tropic Marin in order to bring CA and Mg down a little.
Tank looks stellar too