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If you have algae growing, your PO4 is not zero. Your reading zero due the the algae consuming the phosphates.I wish there was a way of manually removing mine. It's so entwined throughout the rock that its just not capable. I would have to break down the entire reef structure, remove the rock and proceed. I haven't added GFO because my NO3 and PO4 are both 0.
Epicwin - What laser did you use, lol? I hadn't thought about getting high tech.

