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I have an RODI system. It's just not close by to my tank does that make a difference? And I just invested into the redsea test kits. I haven't used it yet. Should I be testing the water even if nothing is in it? Any that are an easy set up that you would recommend?
No, the RODI system can be anywhere.
The reservoir for RODI (say 10g) is usually next to the tank, or underneath the cabinet (if any).
IMO, you really need to get the ATO going first so you can keep salinity stable at 1.025-1.026. Without salinity being stable, everything is out and testing mostly useless.
So get salinity in check first, then test, at the same time of day each time. Record the results. It should never fluctuate if the ATO is in place and working.
Many ATOs are the same. You need to have one with an IR sensor (which controls the fill) and either a second IR sensor, or mechanical sensor to stop an overfill if something goes wrong. Should come with a pump, some tubing, and a power source. Lots on
Amazon, see which you like.
Without the ATO, it makes it harder and depending on when you fill by hand, causes fluctuations in water chemistry.
As to the question of should I test with nothing in the tank, I’d say sure. Your goal is to create an environment in which your animals will thrive.
Focus on salinity, temperature, and Alk to start, let’s get the big ones done first before we tackle nutrients, Calcium and Magnesium.
There’s a ton of videos on different ATOs and their setup, it’s not to hard at all.