Dark brown spots and curled dry leaves

Hi, am growin a lowryder, there have been ps and down with it, but till now its ok, i just got some leaves which have curled up and look really dry and some leaves having dark brown spots on em. Maybe you might help me troubleshoot this, am shit scared, its my first growth.
Here's my grow journal https://www.rollitup.org/grow-journal-discussion/195496-1st-attempt-lowryder.html , and attached are pics.

ps. i don't have a pH meter. Growing in soil using cfls. Last not normal thing i did was to add a small pinch of phosmogen mixed with 1.5 litres of water in the soil.

hmmm its hard to tell the cause looking at those pics. what type of soil are you using? I highly reccomend getting a pH meter, pH lockout might be your problem

I've trimmed off the sick leaves, here are some better pics of those sick leaves. i hope they don't happen again.

I've read dark brown spots can also be a sign of magnesium deficiency, perhaps look into some epsom salt?

But only do this if someone more experienced gives you the same advice.

Good luck.

have no idea what epsom is, but thankfully, after i removed the weird leaves, the plant seems to be going on well. Thank god that it didn't turn out male.. after all these incidents that happenned with it.. i was afraid... my first female plant!

Gratz!