Yup that looks like mag to me. Especially the leaf where is runs down the edges.
Example
You should see it clear within a few days to a week. What are your nutes and do you check ph and run off?( I don't - organic). If its low give them a little flush and in the last litre for yeah give some Epsom salts. Iv read somewhere that if your plants get a mag def they may get a calcium def later in flower, this did actual happen to me onto last grow on one of my plants. I not sure if this is completely true but it seemed fair.
And bro this thread is the manual for GN lights, maybe start a new thread in the GN section, before a Mod mentions it
Example
You should see it clear within a few days to a week. What are your nutes and do you check ph and run off?( I don't - organic). If its low give them a little flush and in the last litre for yeah give some Epsom salts. Iv read somewhere that if your plants get a mag def they may get a calcium def later in flower, this did actual happen to me onto last grow on one of my plants. I not sure if this is completely true but it seemed fair.
And bro this thread is the manual for GN lights, maybe start a new thread in the GN section, before a Mod mentions it