Can anyone help what is happening

Hello everyone I’m hoping for some input it’s my first grow I’m im haveing problems with my plants except one the leaves are Turing yellow and I’ve check my ph on my water and it is 6.5
I’ve had a slight problem with over watering so I’m slowing that problem down now problem being is my one plant is great and full so I’m at a lost

Seed- super sunk fem by ILGM
Soil- ffhf
3 gallon pots
Humidity is between 49 and 55
Temp is between 70- 77
Fan blowing in plant
Light is a knock of hlg 240

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Looks like you need some Calmag for the plants and Mosquito Bits for the fungus gnats.