|Topic Review (Newest First)|
|08-13-2003 08:16 PM|
For potassium, you don't dose for the whole tank each week. That would lead to a steady increase of chemicals in your tank. You can not assume that the plants take up all the nutrients supplied, and since you can't measure it, to be on the safe side you only add enough to bring the replacement water to the desired level.
For NO3 (KNO3-dosing) you should monitor and dose according to your tank level. Fish poop and decaying plants all add to the NO3 level.
For example, if your test kit says 0, you should dose for the entire tank, to bring it to 5 ppm. But you need to be careful and do this gradually, since sudden changes in water chemistry can be harmful for your fishies. Plus the testkits I tried are not very precise in lower levels, between 0 and 10 ppm.
|08-13-2003 07:34 PM|
Originally Posted by Wasserpest
|08-12-2003 05:13 PM|
You can't really test for Potassium. Just take Chucks calculator, plug in 1 ml water, your tank size, and then play around with the teaspoons and see how many you need to get to 20 ppm.
After a gradual initial addition to bring it up to that level you will be dosing just for the water that you change.
|08-12-2003 05:12 PM|
Scott if you click on that link it will tell you how much to dose for your size tank. There really is no need to test for potassium because it really isn't very lethal until you get to obsurd concentrations.
The easiest way to get some is to go to your local garden store and ask for "Muriate of Potash". Almost every garden store carries it, it is pure K20.
|08-12-2003 04:57 PM|
since i am starting to dose from dry ferts... how do i test for Potassium?
I read that potasium is not a danger fert so is there a rule of thumb for dosing it?
|08-12-2003 04:52 PM|
From what I have read, the Potassium provided by KNO3 is not enough to reach the "optimum" 20 ppm level. Also, when you get a higher fish load, you will dose less NO3, but still need the same amount of K.
Having said that... If your plants look healthy and you don't have other (algae?) problems, I would hold off with K2SO4.
If you start to see holes developing in older leaves (in swords, for example) you might want to start looking for K2SO4.
|08-12-2003 08:38 AM|
K can be dosed by K2SO4
|08-12-2003 03:35 AM|
If i am dsoing prilled KNO3 and paying attention to the nitrate levels should I assume that my Potasium levels will be in the range needed?
KNO3 - Potassium Nitrate K - Potassium 38.7%
NO3 - Nitrate 61.3%