That's certainly a fine choice to not dose . But you keep posting misleading stuff about elevating sodium. That will force me to keep posting why that is wrong.
Many folks dose sodium bicarbonate or carbonate for alkalinity. Boosting alk by 1 dKH (0.36 meq/L) with sodium carbonate or bicarbonate adds 0.36 mmoles of sodium per liter, or 8.2 ppm of sodium PER DAY. That's 273 times as much as the phosphate dosing. That's the place to look if you use that sort of material and your elevated sodium did not come from your salt mix.
What about salt mixes?
Here's a study that Craig Bingman did a number of years ago.
How much does sodium vary? At a fixed 35 ppt salinity, sodium varied from a low of 10,166 ppm in Tropic Marin salt mix to a high of 11,592 ppm in Seachem salt.
If you start with normal 35 ppt ocean water at 10,800 ppm, how long would it take before you rose above the Seachem salt mix level of sodium? At 0.03 ppm per day? 72 years with no water changes and no correction for the salinity rise.
That is what you call a slight negative? All but one of salt mixes in that study started low in sodium. For them it is a slight positive. lol
