Ok I manage to borrow my buddies test kit and it looks like as of last night my PO4 was reading at 8 . Yikes! so this morning I changed out the GFO and carbon and so far within the past 12hrs i did a quick test and it now reads 0.
I noticed my sunflower was starting to stretch out again so its a positive sign. However I do need to clean the sand up a bit and probably change out the GFO again within the next week or two just to keep things up to par.