Chris... I couldn't find it either but there was one little mention of it somewhere and I believe it was mentioned not to adjust.
IMO... maybe because it's a difficult parameter to measure? I don't know.
However there are other opinions and ZEOvit tanks are known to run very low in potassium, possibly because Zeoliths absorb Potassium.
ZEOvit claims:
Potassium is a major element in sea water at a similar concentration as calcium, at a
level of 380 â€"œ 410 mg/liter. K-Balance contains multiple potassium salts as well as two
additional available elements in highly concentrated form. Our tests in several tanks
with a known potassium deficiency have shown the benefits within days of dosing,
resulting in improved coloration and growth throughout the tank. K-Balance adds the
elements that are partially removed via skimming, especially by needle wheel skimmers,
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 Polyps are completely withdrawn and colors are light and without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.
AWT claims:
Your potassium level is too low. We recommend performing a partial water change,
and possibly adding a commercial additive containing potassium. Potassium is rapidly
depleted from aquarium water by several plant and animal metabolic processes.
Maintenance of appropriate levels is critical for cellular respiration, as well as being an
important nutrient for coral zooxanthellae and macro algae.
It could be hogwash, ZEO trying to sell an expensive supplement, or AWT finding that "parameter" that doesn't mean too much like the Silica one awhile back. Who knows... but if I can raise mine to NSW levels for only $5.00 then I'll give it a shot and see what happens. Doesn't sound like it will hurt anything.
