I thought I read the dosage for PO4 was 1/8th TSP, 3 times a week, as opposed to 1/4 tsp. I run my phosphate in the 2-3 PPM range with 3-4 WPG. Good growth, and minimal algae.
I wonder if it's the test.. thats a good point.I found I needed to back off on phosphate but did not want to cut out potassium so added Pot sulfate to the ferts.
I also had to do the calibration check and found that my reading of the phosphate was way off. Test sets can do a job on us if they make us think we know what we are doing when we don't?
http://www.plantedtank.net/forums/showthread.php?t=83545I wonder if it's the test.. thats a good point.
is there a simple way to calibrate?