You should definitely have a TDS meter and test your RODI output (should be 0), and also your RO (before DI) if you can. I have an inline meter on my unit that does both.
But yes, you need to get your P04 down if you want to have good SPS growth. Surprised you're not having any algae problems?
Yup, it's a challenge, and that is also part of the fun with this hobby. You'll figure it out, I'm sure.
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