If it really was an issue with nutrients, your LPS and softies would be having issues, which they aren't, right? And you said you feed a ton so I don't understand why others keep saying its nutrients. Anyway, the test results will be interesting. I still suggest carbon in a reactor and water changes in the meantime.
It's possible to feed a lot and still have low nutrients. Adding carbon is just adding even more filtration and polishing the water more when he's already at 0 nutrients.
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