So just an update:
Last week, I did a total water change of 125g spaced over 5 days. Immediately after the first 50G I noticed the blastos and acans fattening up. Over the subsequent 50G, and another 25G water change, my Gonis were extending far, mushrooms, nems, and rics brightened up and has very noticeable color improvement. The zoos that I had were opening up and coloring a lot more as well. I just tested this morning, Phos is .5, Nitrates are at 40.
In response to the Phos, I added more Aquamaxx GFO; regarding Nitrates...well, I do have a heavy bioload (20 total fish) so I presume its to be expected. However, I will implement either 15G weekly water changes, or 30G biweekly WCs (not really sure what's the preferred method for stability).
Salinity is 1.026,
Ammonia and Nitrites are all 0.
Mag 1450
Cal 480
dKh 9.8
pH fluctuates from 7.8-8.1 via Apex
Temp has been maintained between 78-80degrees.