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Oh absolutely, corals are animals. But I kinda think of them as plants, because I’m good at keeping plants alive and helped my dad keep a garden growing up. (It’s something I already understood). I was only half joking about fertilizer- nitrates and phosphates are what helps the grass grow! But, just like in the reef tank, you don’t want to use too much, however some is better than none at all.
there is absolutely a large range that your nutrients can fall into while still keeping a successful tank, but there is of course some “optimum” numbers that achieve the best growth and coloration. My Ca being so much lower than NSW is obviously still growing my SPS, after all there IS available calcium, just not as much as I would like.
At least, that’s my understanding of it.
I think those optimal numbers are always provided since reefing is so difficult and ambiguous. We just know at those ranges everything will be ok.
But you have reefers like yourself at 350 calc and others with 1ppm phosphate whose tanks are growing.
Those ranges just encapsulate both the balance and amounts required without the user having to do any additional think work.