You can start babies around this time and go perpetual, just try and time it right so the light height is not so insanely different but i guess you could always boost them up on boxes providing the 4 giants you have don't block the light like a rain forest does below its canopy lol i doubt it tho, my 4 giants can't completely block out the light below and my baby is doing ok, their ages are 7 weeks on my 4 giants and 4 weeks old on the baby below and it works pretty good. when dry time comes i'll move the baby to a 2.3x2.3 tent i have ready.
As for using colloidal silver or STS (I never used STS) i recommend getting a cheap useless tent like a 2x2 or smaller and throwing 2 plants in there applying CS/STS to a branch or 2
NOT THE WHOLE PLANT like i did. you don't want a nuclear reactor of pollen like what i have going on plus you can smoke the rest of the buds if you only apply it to a lower branch or 2. you can not smoke any buds that CS/STS were applied too, bro science says it will kill you.
I can agree with our body not being able to get rid of heavy metals but i think i will risk vaping it in my solo or extreme Q still... i looked up the vape point of silver and it comes nowhere close to the 225C max i go on my vape.
Sorry for the long talk i just vaped red gorilla girl xl that i chopped yesterday, a few buds fell off when i was drying off buds i washed (dropped the plant in the dirt
) i dried the small buds and vaped them this morning and I'm pretty stoned