Didn't read the whole thread but try sand-sifting inverts.
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Paul did you ever get your brown algae under control? If so what did you do?
Are you having the same issue with the brown algea? I got my self a blue diamond goby to sift through my sand, I have a deap sand bed so my sand is doing fine, the goby is doing a good job with keeping the sand white. I need to get myself some better quality test kits.I have to retest to be honest. I tested last week with my Hanna and the phosphates read 0. Nitrates from my api kit read between 0 and 5ppm. I have a Red Sea pro test kit here I'm going to test with but haven't done so yet. Haven't had time.

