it should be no higher, than 0.015ppmOh...the manual with the test kit states:
0-1mg the ideal concentration of phosphate should not be greater than 1...
I've got another 40% to change i nteh morning anyway so it should reduce further. The cyano has receded lots sicne the last big water change.
I dunno about 0.015, heck no hobby-level chemical test kit can reasonably measure that far down, you really need a photometric sensor to really detect levels that small. FWIW 0.03ppm would be fine IMO
Apologies for the awful quality but my camera doesn't seem to like the fast moving clowns!