something of the zeovit guide....
Potassium deficiency can be diagnosed in different animals as follows:
Montipora, especially plating types, display slower growth and appear washed out to
grey. Latent potassium deficiency may also lead to tissue loss, spreading from one or
more spots. Stylophora and Pocillopora appear as if they have been exposed to air for a
long period of time. Polyps are completely withdrawn and colors are light and without
depth. Seriatopora may completely loose all tissue, starting from the base, within only a
few days. The pink coloration may turn into a light brown. Acropora may loose their
color and get lighter and pale. Growth stops completely. If the potassium deficiency
continues tissue is lost, mostly starting from the base. Tubinaria Reniformis stops
growth completely and withers away.