Your rock will leach phosphate for awhile. Go easy on the GFO if you're using it because once the rock is done you don't want zero phosphate.
as for leaching phosphates.... im pretty sure it was from food and maybe some old rock....nothing to horrid, most of it was either dry rock and/or rock from a previous low Nutrient system, i also like to feed my fishies...
also im running bio pellets and not GFO... it will all balance out and prob end up around .01-.03 like my frag tank.
as for stocking list:
(2) osc clowns
(1) Clown Fairy Wrasse
(1) Tomini Flame Fin Tang
(1) Powder Blue
(1) Hawaiian Yellow
(3) lyire Tail Anthias 2f:1m
(1) Sunburst Anthia
To come:
(2) cleaner shrimp
(1or2) potential fairy wrasses... unsure if i want anymore fish
Slowly dialing in my doser for the right levels =)