I run GFO and NoPox, 24 months now. My goals are nitrate 5ppm, phosphate less than .05, but not 0. Through daily use of NoPox and occasional use of GFO, I have maintained those numbers always.
That being said, I used an LC like agent green to clean up the majority phosphate, and the Rowa, only to mop up the last bits, yes, Rowa would exhaust in days with high phosphates.
Hanna is good but expensive, keep in mind that it just gives a result on colour.
I use the Salifert Kit which is half the price for twice the tests and find it easy to read between .05 and .25 or higher.
Use LC to get phosphate down to .1, then GFO to .05.....then take it out until you reach .1 then put it back in......
I found NOPox worked great for Nitrate, but it's effect on phosphate was minimal, but reduced a tad.
Keep in mind the NoPox enhances bio filter stuff which consumes and then is skimmed out, phosphate gets into the water potentially at source, in storage, by adding foods big time, hands in the tank...
Maybe this will help....just keep up what your doing....soon it will settle down
Great stuff thank you Unc! Ughhh I have been puttin my arms in tank to toothbrush algae off occasionally. I don't think I feed much.. I have the salifert test kit as well but just
can't tell what levels i'm at exactly. If nopox isnt that great at reducing phoshpate levels
I may need to get more GFO, but want to test first .. I still think I wanna pick up a $50 hannah cheker lol.. ughhhh...I think knowing my phoshpate levels to the T will come in handy down the line anyway.
LC option maybe too advanced for my taste. I think Nopox and water changes and time/Testing and manual removal will do the trick! I may need to grab a siphoning mechanism to siphon out the remaining HA