Join Date: Feb 2003
Location: Boston, MA, USA
Just to put in my two cents about Potassium overdose.
I have diagnosed an overdose of potassium in my tanks. The symptoms in my case appeared first in heavy root feeders like my swords and vals. New leaves were stunted and deformed, leaves would curl and fold back on each other, the vals, formerly reaching the top of my 90 gallon tank with ease, now formed a wad of tangled, brittle leaves that were no higher than a few inch.
Since my water is extremely soft I used to dose the following: NaHCO3, CaCl2, MgSO4, KCl, KNO3, PO4 and Traces.
Since about two weeks I cut down the KCl to zero, and my Ozelot Sword has put out two new leaves since then that look great. No deformities, nice color and speedy growth.
So, in my experience, Potassium overdose (or Calcium/Magnesium deficiency as some suggest) manifests itself not as yellow and brown leaves, but with stunted and deformed growth.
"Save me Jebus! And I don't even believe in Jebus!!!" Homer Simpson