I just installed an Apex on my system (very new to aquarium controllers). I want to have my RODI feed a small (3.5 gallon) ATO reservoir under my tank and for the Apex to control the level and feed top-off water a couple times a day to the sump. I will regularly monitor TDS as I know salt creep may be an issue. I don't even know what control questions to ask to get this done and what parts I need? I would also prefer to minimize drilling holes in the reservoir for float valve(s). Any advice on what I need to safely accomplish this? Thanks in advance.
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