SOOo many probs with my babies. please help :)

so i stoped givein them mg but once a week now, the black leaves/yellow leaves/brown leaves have stoped. i was pullin them off as i would c them + i was draining the soil out (3x the ammount i normaly give them every 2 days not every day) and now there growing like fire to once a week (1/4th strenght) neturents. there pushin 5 foot atm ^^, they startin 2 rly presex now.

any1 got any idea about what a white mold means? lol maybe its just made by spiders as i have quite a few on my plants ( the pesticide i use kills 90% of the bugs that would kill my plants and i leave the spiders 2 kill the rest > lol ). but i c this white mold onthe steams of the plants sumtimes. only noticed it 2 times and it has been rather humid out this summer. any ideas?

Take a (bright) picture of it. If it is mold, make sure you trim it off quick before it spreads.

The other pictures were kinda dark, but the plants look good to me...

i figured out that it was a type of spider we have here. it makes these bushy small webs on the stocks of plants. they look like cotton/mold ( like i thought). ill post new pics 2marrow sumtime. they r doing good, i just gotta hack out the other 2 males . i think they are but im gonna make sur, id rather risk havein a few seeds than 2 lose 2 4ft+ plants.

ill post sum new pics in a few days hopefully, they are pushin 5 ft to 6 1/2 feet now. none the less, i think ill have sum monster 8/10 ft'ers on my hands at the end. lol im so excited now, i can get high off the leaves so i rly cant wait for the bud now lol. its all payin off ^^, . only 3 more months >

Can anyone help me there's some like brownish spots appearing on my plants leaves and idk what's wrong possibly a deficiency