Can't help with a recommended test kit as I've not tested for phosphates in about 20 yrs now. I tested when I first started the hobby but then realized that I was ALWAYS adding phosphates every time I feed the tank with anything so why bother.
I didn't have to test to know I had a problem as I could see the changes in the tanks.
If my husbandry protocol wasn't sufficient for the various maladies that could arise, I changed my protocol to what would be sufficient.
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