API test suites are usually the simplest test suites. I ended up getting the Red Sea KH test set and finishing with a point difference. The difference in calcium levels was 50 ppm (Red Sea below range). As long as you do water changes with quality salt, you don't have to worry too much about the parameters.
Fish Water Quality API Test Kit
9 Review
Highly Efficient Seachem Purigen for Freshwater & Saltwater Filtration
9 Review
FUNSWTM 7 in 1 Aquarium Test Strips: Accurate Water Testing for pH, Nitrite, Nitrate, Chlorine, GH & KH Levels
8 Review
π Seachem Stability 250ml: The Ultimate Fish Tank Stabilizer for Freshwater and Marine Aquariums
9 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review
Mini pump Xiaomi Mijia Electric Pump 1S, plastic, black
55 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review
Vacuum cleaner TEQQO Aquastick 3 in 1 Power, grey/turquoise
26 Review