I've got absolutely no clue where to start!

I have not tested for metals. How can I?

Sometimes water suppliers will post what they test leaving the treatment plant and you can use that information. Otherwise, it would be a <gasp> pool store test. Our municpal water has a water quality report available which shows the information in a section titled "unregulated substances in the source water". For my water, I see

Copper @ 0.3 ppm
Iron @ .28 ppm
Manganese @ .04 ppm
Magnesium @ 24.5 ppm

along with a bunch of additional numbers including alkalinity, hardness, pH, sodium. Which now that I'm looking at all this information, I need to double check with the water utility. My testing at my tap is quite different than their numbers. I wonder if my testing is bad or the report is old and needs updating.
 

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I have 9 gallons. I found some more in the pantry! LOL it’s everywhere ?

Should i add 4 more?
Yes of course! :D

Just forming a plan here:
Once you get an OTO reaction darker than 5...
Do you have enough FAS-DPD reagents for one night test (after last light) & one am test? (before the refills arrive)
 
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