I was told the same thing when I first started this hobby... I must admit I was attracted to the colours. Salifert is a reliable brand of test kits, and many reefers have been using it around the world, so you can give it a try.
You might wanna consider LEDs with higher output. PAR30s should be sufficient for your tank size.
Once the beneficial bacteria have been established, it is not necessary to dose bacteria.
I'm not sure what the stock filtration consists of, but ChemiPure is like a form of carbon, so it serves as a chemical filtration. Different purpose. For a tank this small, it may be more beneficial compared to the stock filtration.