yellow bars on leaves

[CaptainWiese91]

Magnesium is my proposal, look leaf symptoms up - under magnesium

[dseegy]

This is what I have happening

[dseegy]

[gbauto]

Pics are helpful

[dseegy]

Hello All
I have my 4 plants and they are growing really well but I am starting to get yellowing on the leafs. they are about 3 feet in height and I have light about 18 inches above plants
I turned light down to 50%. Any help would be appreciated
Thanks