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I'm taking a sample of water to my LFS in a little while. Also, I didn't know test kits had an expiration date an do don't see the expiration date on them, I just see that they're from 2006. So I'll be getting a new test kit at my LFS also
The older API ones made around that time had their expiration dates printed in a kind of ink that would come off very easily. They are cheap for a reason and I'm very sure they have long expired by now.
Phosphate don't get reduced by simple water changes. Rocks and sand would absorb them and leach them back to the water as time goes on. If you aren't running anything to specifically combat phosphate, you will need to look into that.
You are also missing a magnesium and kh test kits. IME, API is okay with ph, kh, Ca, No2, No3, and Nh3 as long as you make sure they aren't expired. Salifert is what I use for phosphate and magnesium. I also have an iodine test kit from Red Sea but don't find that parameter to be as hard to maintain.
