Join Date: Jun 2014
Location: Cape Coral, Florida
Help me understand Potassium
I don't have a way to test potassium.
The basis of my question is, whether there is any guidance as to how fast Potassium is consumed in a moderately planted tank.
Here's the story:
Some time ago I had signs of potassium deficiency (pinholes in annubias) when I was adding none (only in water change), and did some math at the time, and started adding it daily at roughly the PPS-PRO rate (I thought).
Now (months later) I have some symptoms that looked like potassium toxicity, so I reran all the calculations myself (the current version of the calculator I used is broken), and found I am adding about 1.4g of potassium daily, and I think PPS-PRO calls for 1.01g daily (weights are elemental K).
But then I looked at Equilibrium. In each water change (about 80G) I add about 128gm of Equilibrium, which is (per Seachem) 19.5% potassium. If I did the math right, that means my 80G of water is at 70ppm potassium (25g K) in each water change, which was surprisingly high. In fact that seemed a bit high in general (but it's only dGH=6 as a target).
And while I am aiming for monthly water changes it's been more like every 2-3 weeks based on nitrate levels.
Here's my question: In what I would call moderately planted, no CO2, how fast does Potassium get used?
Is it possible I'm reaching toxic or damaging levels between Equilibrium and daily dosing?
I was just going to buy a kit, but didn't see a fresh water version (saltwater kits seem only good for high levels like 150+).
Is there really a chance I'm over-dosing?
Does the math seem right?
Latest tank build:
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