Tank start up is the KISS system.
Keep
It
Simple and
Stupid.
The 3 types of filtration. Biological, Mechanical and chemical.
Water changes and your test kit.
If you get no reading at parts per million (PPM) marine grade.
Test in parts per billion (PPB) scientific grade. If you find yourself
doing water changes less often and just topping off for evaporation
you then might want to use a salt with a higher mineral count.
As for example tropic marin is good for regular routine water changes.
I changed %10 from a 50 gallon every other week.
Someone who has excellent parameters who does water changes
only let's say %5 of 50 gallons once a month would need a higher
mineral count.