Poorly plant

-only water her wen the pot is light aswell.. 👍🍀

Hello.. Hope you are well.. Tbh they just need repotting.. How old are they.. Just repot them.. In a wk wen they are recovered from transplant shock and show active signs of new growth then just snip her old yellowing/pale bottom leaves off.. Stay safe n gud luck with her.. 👍🍀

Start treating this one differently. Give it a good run through of water - hopefully 6.5-7.0 pH - with ~20% runoff. Stick to that for another watering or 2 (wait for top 1/2" to be dry in smaller pot), so a week or bit more? If it starts to fade worse, start feeding again, immediately. If it perks up at all, stick with it even with slight fade. It'll be droopy after heavier waterings, so walk away from it before assessing again. Give it 12 hours or something. Often the best thing is to do the least possible. you'll need to feed one way or another. e.g. you could keep re-potting with soil that has nutrients as long as it's enough to last each increment of time between re-potting. get some cheap pH strips that resolve down to .1 pH. In reality, they'll be less accurate, but good enough for these purposes. Once you know your tap and anything else you put into soil, you can assume the measurements will remain consistent, but spot check for a bit -- well water needs to be tested more often since it is potentially impacted by rain and other runoff. Once you know it, you can just take a note of it and skip buying a new pack, or just keep a few around to be handy when problems crop up. pH problems can cause every and all deficiencies and toxicities. of all the things to know, it is an important one.

Check that soil isn't compacted down and is loose. Might be oxygen starved. The single leaf set is natural to see turn yellow and die off. I normally pinch them.