Thanks! I wish I could take full credit, but like anything in this hobby, I was bootstrapping an idea I read about here on R2R.
Long story short: I was reading on nitrate dosing and posted about stump remover freaking me out. Randy HF was kind enough to link me a food grade sodium nitrate. I then found another link where Randy and another reefer figured out the math to take that powder and dissolve it into 1L of water. I used their math to make my own fluid. I also happened to have some older Sodastream polycarbonate bottles that were exactly 1L laying around so I repurposed one as my nitrate liquid holder. I then began very lightly dosing to test and saw almost immediate results with corals being happier. I tested, upped dose, tested, upped dose, etc. but was still hand dosing because it was 20-25 drops per day...not really enough for doser.
However, I had been using lanthanum chloride (specifically Brightwell Phosphate E) regularly as a phosphate management tool and saw where someone had been putting it in their ATO. Randy had signed off on this process (as I am not a chemist, I try not to do anything without a subject matter expert weighing in) so I felt good about trying it. I did the math and put the lanthanum in the ATO with great results. Phosphate ways staying very stable and Deltec was pulling out the gunk. Winning!
Well, then I was getting ready to go to MACNA...do not trust husband or teenager to dose tank. Tried to logically think through adding the nitrate to the ATO on top of the lanthanum. Seeing no conflicts or reason they would cancel each other out, I gave it a try. Came back from MACNA to stable, good looking tank. Need to do full weekly test panel tonight because I am a few days behind to see if the dosing was too much, too little, and adjust accordingly.
I am happy to provide links to products and math posts I used if anyone is interested. I will also post test results on my build thread tonight or tomorrow. I really, really like the process so far. The tank gets a very diluted amount of phosphate remover and nitrate 24 hours a day. The only very small challenge is waiting until your ATO reservoir is nearly empty to fill up each time so your dose is regulated and even. I hate when that container is low so that's annoying my OCD...

. But a small price to pay.
Probably way more than anyone wanted to know but hey, I had a lot of coffee this morning!
Best,
Denise