Potassium deficiency

[Rita]

Hey guys,

Based on all the pictures/ charts on the inter webs it seems as though my two Java ferns are experiencing potassium deficiency. New leaves look good, then they develop tiny pin holes and eventually look as though the leaf is eroding from the outside in while turning yellowish/ brown. I dose my 20 gal long with the appropriate easy green once weekly and water change about once a month. Nitrates remain a steady 20ppm and all other levels are within normal limits. Is there a product out there that allows me to dose only potassium? Am I stuck dosing easy green more frequently and just keep an eye on my nitrates? Or do I have to water change more often to replenish the minerals present in my hard water?

I'm open to suggestions. Thanks!

Edited June 2, 2021 by Rita
Typo

[firstname-lastname]

Flourish potassium is good for adding only potassium

[Mmiller2001]

https://greenleafaquariums.com/products/potassium-sulfate-k2so4-1lb-bag.html

This will last forever.

[Patrick_G]

I use API Leaf Zone. It has potassium and iron. It’s almost always available at the big box pet stores. It might not be the best but it’s been around forever and seems to do the job. 

[Acara Mom]

My PO is so low that it is not on the test chart! I add flourish PO a couple times a week and I'm still struggling with low P.O.  I wonder how much is too much?

[Rita]

1 hour ago, Acara Mom said:

My PO is so low that it is not on the test chart! I add flourish PO a couple times a week and I'm still struggling with low P.O.  I wonder how much is too much?

Is there a test kit for it? I just diagnosed based on the way my Java ferns look. I bought seachem potassium and it said I could dose up to 3 times per week.

[firstname-lastname]

I don't know about potassium because I haven't tested it, but for nitrogen flourish I dose double/triple their recommended amount to get my nitrates to read above 5-10ppm. Their recommended dosing is quite low to make it almost impossible to cause harm by following their instructions.

[Mmiller2001]

1 hour ago, Acara Mom said:

My PO is so low that it is not on the test chart! I add flourish PO a couple times a week and I'm still struggling with low P.O.  I wonder how much is too much?

1-5ppm is a good range.