To interject with an outside perspective here : agreed that a little PO4 is beneficial. I wouldn't however, tank any advice from a reefer who let(s) their phosphates creep up to 1.65
Your right, don't take advice from me, take it from the current chalices I have...not like I need to explain, but the tank that got up to 1.65 wasn't my main reef tank it was a full non photosynthetic and seahorse tank, both require heavy feelings, and even a week late on changing the gfo can cause a spike this high when you are feeding that heavy. But as I said, here is what I currently have growing
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