There is very little precipitation in the macro mixture. Definitely less than 1/2 tsp sitting in the bottom.
What if the precipitation is P and plants donít have enough.
The city waterworks report says 12 ppm Mg which is more than enough. You donít need any MgSO4 in the fertilizer so if you wonít use it you will have proper solubility of 87% instead of 100%. This will fix the precipitation issue.
Lowering micro dosing from 5 ml to 3 ml will change daily dose from 0.18 ppm to 0.11 ppm Fe(TE).
Aeration is good for many reasons but airstone removes precious CO2 at very rapid rate. That is not what we want, we want to saturate the water column and achieve consistent levels. I found internal sponge filter driven by air pump with 90į outlet at the water level the most sufficient in terms of oxygenating water and conserving CO2. As an additional benefit it also serves as a surface skimmer.
TDS is a comparative tool, it tracks changes.
Your tap comes with TDS value. Adding fertilizer increases this value. Also, substrate, rocks and decorations do and most elements that dissolve increase this value. So what we want is to maintain consistent value. This is done by balancing, fertilizing and dissolving materials keep increasing it, plants and water changes keep lowering it. Experience will show what amount and frequency of water changes is the most effective.
For example, if we donít add fertilizer for three days and we see TDS rising then it indicates something dissolving or leaching in the water column. This has to be taken in consideration as non-fertilizer related TDS increase and include it in the water change rates.
The other part of TDS increase is produced by fertilizers. This should be balanced by creating ratio between fertilizer amount and water change rates.