Join Date: Oct 2006
Location: Ranchi, Jharkhand, India
You could do a 72 hour blackout.
A water change, feed the fishes, dose the phosphate, do the blackout, water change again, and go with lights and excel/metricide. I think that your problem will go away.
PS - Calculate the phosphate dose to 2 ppm and see if you need potassium too.
If you have a choice, you have a problem, till you elect your choice. No choice, no problem, only consequences, learn to live with them.