My first grow "gorilla glue auto"

You can do 12-12 from seed if you want the energy savings personally I like to veg em on 18/6 since minimum I would say is 4 weeks.

What you've got here is a calcium deficiency and it's pretty typical to develop this as the plant goes into flower. One thing you need to do is to cut back on your BioGrow - too much nitrogen will create a lockout and the plant won't be able to get to the calcium that is normally contained in the nutes. You can choose to do one of two things here... you can flush your plant with pH'd water that is 3x the pot volume (you're growing in about a 4 gallon pot so that means you'd need to run 12 gallons of pH'd water through each)... at the end of the flush, you can give it some nutes but cut the BioGrow down to 1/4 of what you've been giving and the rest cut to 1/2... and add in a dose of calmag. After they dry out, you can water again and then resume your normal nute amount BUT do not give more than 1/2 strength BioGrow or you'll end up with a lockout again. The other way to do this is to give only pH'd water for the next week - clean out the nutes/salts that way... next week, resume feeding but again cut the BioGrow to 1/2 of what you've been giving and add in some calmag once a week. I personally wouldn't recommend this as it will take a while to correct the problem and the damage will be ongoing while you slowly get the plant free of the lockout... but it's your call. This is also the time that other deficiencies can start to pop up - so if you want to get on a preventative course, get a good PK booster and start feeding that to them as well... flowering requires a large amount of potassium and phosphorus and this is the perfect time to start getting those nutes into the plant. Good luck!

Yes, it is fine. A autoflower does not obey light schedules. They do like to have rest so i do not recommend 24 hours light. The more light hours they have the better they develop overall. They are on a time schedule. 🌱👍🏻

I agree its not a pollen sack / ball its a swollen calyx, pollen sacks tend to be more pod or football shaped, smooth without trichomes, have no stigma "white hairs" and hang off of little stick pointing down. This calyx is also pointing down and has a dried stigma but lacks the other characteristics of a pollen sack or "balls" as they are widely known. Good Luck!

a garden is a humid environment. Many tent poles are the cheapest, shittiest material possible that will rust through the paint. stop spraying the poles with anything that can oxidize it, and that will help, but again.. RH% of a garden will make it happe eventually with metal prone to rusting. rustoleum? LOL stainless steel poles? probably won't see that. it may not look pretty but will not harm anything either.