@Randy Holmes-Farley and every other reef chem experts, I've noticed some weird pattern with the addition of a fish to low phosphates in my tank, the system is about a year old, 120 gallons,n LPS dominant and no water change and po4 usually sits around .06, but I've noticed during both times I've added a medium sized fish the po4 seems to go down!?! I checked today and it was at 0.03, which is the same number it was at last time a fish was added... I don't frequently check nitrates but other than the fish the only things that change were me replacing the GHA in the refeugium (as it was decaying during a recent power outage) and me feeding the corals less at night to make room for feeding the fish during the day. I don't know if the fish or the refeugium is what is contributing to these numbers, any ideas?