Fudsey
Jack of all trades, Master of none ;-)
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My Tank Thread
I tested my dkH late last night and it was higher than my last test by a bit, up .5. So I turned my dosing way down. I'm going to test today to see exactly where every thing else is. An ICP is on the agenda.I'd cut back on the GFO and let your PO4 come up to 1ppm to 0.1ppm to 0.14ppm. Typically, 0.07ppm would be fine but you may have something interfering with your test and could be bottoming it out.
Edit: Or you could send out an ICP sample to verify you have what your test kit shows.