Iron deficiency? Nute lockout?

Ok so I have 4 plants and one if them is doing horrible. After being transplanted to the new pot everything was going good, the only thing I've done differently was use bottled water instead of the usual tap water i was watering them with since planting the seeds. Im assuming I screwed up the ph and caused all kinds of problems. No I do not have a ph tester or ppm tester or anything like that but I will soon be investing in them. I would like to know if any of you know what exactly this could be. I've flushed the soil so I'll see how its doing tomorrow and if it so has a chance to bounce back

Not iron. Iron def starts from the inside out. Thats going outside in. Imo

Fran of PEV said:

It may be a lack of nitrogen

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In new soil? Directly after transplant? what kind of soil must this be that has 0 N in it?

Kassiopeija said:

In new soil? Directly after transplant? what kind of soil must this be that has 0 N in it?

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Oh! I'm sorry! I only saw the quick photo, so it will be for the transplant itself

Its starting at the top, on new growth, so its an immobile nutrient that is missing or locked out.
Nitrogen is definitely mobile. N def shows at the bottom (old growth) first.
Do a search for "leaf chlorosis (yellowing/fading) starting on edges of top leaves and new growth"

Potassium

for the ones wondering what kind of soil, it's some cheap dollar store soil that isn't fertilized (at least I don't think, it doesn't say anything about added ferts) I used miracle grow soil before this and it gave my other plant serious nute burn so I said to hell with it and bought some plain soil and some organic fertilizers. But this only occurred after i switched to bottled water, which was definitely a mistake

Also, isn't it entirely possible that this plant is suffering from more than one deficiency due to some lockout from me possibly screwing up the ph? Either way I flushed the soil yesterday so I guess in a week or 2 I'll see if it bounces back at all