The following are typical recommended brands in no particular order:
API (Aquarium Pharmaceuticals Inc.)
: Should be 0ppm. Typically used while cycling; however, monthly testing is a good habit.
: Should be below 15ppm. Generally not a concern unless you are housing invertebrates; Fish are much more tolerant of higher levels. Monthly testing would be fine.
pH: 7.8-8.4 with 8.2 being optimal. Weekly-biweekly testing. Also search online for Pinpoint pH monitor.
: Should be above 400ppm. Important to those invertebrates with calcifying skeletons. Test daily-biweekly depending on if you are dosing or not.
: 2.5meq/l-4.5meq/l; Shoot for above 3.0meq/l. Important in buffering capacities and calcification. Test daily-biweekly depending on if you are dosing or not.
: 0-0.03ppm. Inhibits calcification and promotes algae growth. Test monthly if warranted.