Wisteria not doing so well

[IttyBittyFishy.]

Hi all,

This has been happening for a while but I just never posted a question on it. I've had some water wisteria in my 20 gal tank for around 6 months now. The plants are growing just fine and producing new leaves. My problem pertains to the old leaves. I'd say about 70% of the old leaves develop brown, dead spots on them. These spots spread across the leaf until I either cut them off or the dead just stops growing. How do I keep the old leaves healthy?

Fertilizer: seachem flourish twice a week (with water changes)
Light: Finnex Stingray

 

[toolman]

I believe it's some kind of nutrient deficiency, but that's about all the help I'm gonna be. Don't know which nutrient though.

 

[Bert2oo1]

Potassium deficiency, you need to get a bottle of potassium (k) and boost it abit [emoji106]

I think you'll find if you read the flourish label it's very low in potassium if it has it at all. U should see improvements in a few weeks after dosing

 

[IttyBittyFishy.]

Thanks for the help. I'll try that.