Ok, here's my update, did PO4 test prior to water change, 0 ppm

Changed phosban and carbon on Friday morning. Also trimmed caulerpa and chaeto.

Added 2nd K2 in frag tank, we'll give it a few days, I have a Sohal being delivered on tues to take care of the algae currently in there.

I already have a phosban and carbon reactor on the system, did a 65 gallon water change today, tested the water this evening

DT:
NO3 - 0ppm
NO2 - 0ppm
KH - 250ppm
pH - 8.0

FT:
NO3 - 0ppm
NO2 - 0ppm
KH - 250ppm
pH - 8.0