Help with first grow please

[Fermented_Fruitz]

Just so u know wind burn actually looks like nute burn or a def too! Makes crusty brown spots all over the leafs and will die off as it gets worse!

Leaf I popped off and found pic of before to show others what wind burn does! Esp when young! Think I gave my lil dinafem some wind burn thinking now of couple leafs I saw watering earlier!

 

[Mooregrow]

That wind burn actually makes a lot of sense as the it’s the plant closest to the fan! .

right guys I brought the bluelab ph pen.
just checked the ph of my tank/nute mix and it was at 5.2!!! Basically been feeding them around there this whole time... strange as 3 out the 4 are doing really well some small patches on some of the lower leaves but nothing major. Checked the runoff of every plant coming out at the same 5.2. BUT the plant with the issues... runoff is coming out at 4.2!!!!

whats the best way to correct this??
I know growing in coco ph should be 5.8 so I will correct my tank

will just feeding at the correct ph slowly correct this?
Or do I need to feed the plant at a higher ph to correct it??