Scolley,
Not sure if you do this already, but with those LFS test kits, I do use a larger test sample then they request. For instance i use 10 to 20 ml reference solution instead of my tests 5ml reference. This allows me to break up the single degree results into 0.25 degree results. Follow? This may help you narrow the margin a bit more.
Without looking to deep into this discussion, out of curiosity, have you backed off a little on your light durations? Could this help ease the algae fight for a while?
__________________
~Glenn |