Help plants deficiency

Feusagit

Hi everyone, few weeks ago I started to fertilize my plants bc they were showing some deficiency signs, some yellowing in ludwigia leaves, cabomba not growing or developping (tho i didn't know which one was). Since then, i noticed that the plants were sprouting new leaves and those were healthy, while the old ones started to get this old yellow tone, with some yellowing coming from the edges and some dots in some of the leaves, so i thought, "okay, maybe this is nitrogen and potassium problem, right?" So I started dosing npk (at this point a just dosed iron, potassium, micros and liquid co2).

The reality rn is this that you are seeing in the photos, what can it be? Theses leaves old yellow will ever come back to green again ?
 

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EbiAqua

Plants cannot repair damaged leaves, it is best to trim low, replant the healthy tops, and let the old stems regrow healthy new growth.
 
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Dennis57

As with any plants whether in a aquarium, house plants or outside, its always best to cut off damaged leaves from a plant.
 
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Feusagit

Thanks Fahn and Dennis57 for replying!
I'm gonna do a hard trimming tomorrow! But, can u help me to identify the source of the problem here? I'm seeing that's a pattern that kind of all plants are showing, as the new leaves grow, the old one become dark yellow, then brown, and then they die. Some will leave before the browning. I see that the yellowing starts from the tips to the rest of the leaf. Is that an nitrogen deficiency problem? Phosphate? Potassium? I just don't understand how fertilizing doesnt seem to do much about this, I mean, there's some beautiful new growth, but even these, the leaves seem to be curled a little, calcium deficiency? Or there's some nutrient excess? I'm really lost here, I'm afraid that I'll do the trimming and the problem will still be there.
 

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