Anyone know what this is/how to fix it maybe?

I'm running a rare darkness from rare dankness and up until now the plant has looked very healthy but now the leaves tips and edges are turning like a pastel whitish yellow

Anybody?

take the pic without the hps on

Here's the whole plant with the light off

magnesium deficiency

Hotboxbudz said:

magnesium deficiency

Click to expand...

i agree use Epson salts to resolve the problem

Thank you! I used dolomite lime and cal-mag plus I'll probably start flushing soon anyway but I try some Epsom salt before I flush

with autos I surgest to use epsons on week 3 and 6 later in bud you will see yellowing his is norm for autos to be n def at last stage of growth

I'm not growing autos though it's a regular seed I have a few fems but no autos