Mg def is really somthing els ?

[Bio boy]

Hi t looks like mg def on my giant plant under led
but I recall slow nickle saying people mistake it when it’s really p
I messed my soil up with mg last time so I wanna be sure wtf do I do
gona fish spray em with ca no mg

 

[Nannymouse]

Running CO2?

 

[BlazinPurps]

Pictures would be helpful

 

[Bio boy]

Pictures would be helpful

Bloody uploaded it 3 times it won’t upload let me get on pc in morning