How can I improve my grow

Read the guides on cocoforcannabis.com. It doesn't matter if you use coco or not, there's tons of good info and they do a good job avoiding the Bro-Sceince nonsense. Read the wiki on DLI. Like most things it's about a goldielocks zone relative to local variables and not "more is better". Daily Light Integral is proportional to hours of operation and area of coverage etc. It allows an apples to apples comparison between gardens of varying sizes and hours of operation. When it comes time to buy a new light you'll be able to discern the good ones from the mediocre. You pay for efficacy. Efficacy = quality. I suggest keeping it simple at first. Form a good baseline of expectations across numerous strains. See the variety/variance that is possible before you form strong beleifs. Once you are familiar, then start doing new things and try to add them 1 at a time so as not to confuse cause and effect as to the differences you see or don't see from your new efforts. This may sound like a slower path, but it'll save you a ton of wasted effort and false beliefs. You can double up on some stuff.. e.g. maybe change up what you do for seedlings and something different in flower -- if the adaptations don't directly interfere or tangled up with each other, you can see the cause and effect without any fog of war. it's easy to be guilty of confirmation bias. We all want to believe what we do has a profound effect, but in teh end genetics is 90% of it and the other 10% is just not stepping on our own dicks or flaps. You can't polish turds. You can't turn a mediocre plant into a killer. There is no product out there that drastically changes results of a competent grower. Ambient co2 - shoot for 40-60grams per sq ft and you are doing fine as far as the things you can control. Bad plants can happen and it's pretty hard to replace anything midstream. E.g. You get a herm and you won't reach 60grams/sq ft.. heck, some genetics without problems will never make it to 50-60g/sq ft. So, apply some common sense when evaluating such things. Plant 150-200% of need. Kill the weak. You won't avoid all problems, but you'll avoid the bulk of them.

Bruce Bugbee videos on youtube provide university level lectures on growing cannabis. His videos is where I began personally. Over 30 years experience growing weed for the government in Utah. Worth it's weight in gold.

Looking good so far I would agree that FFOF is not a one stop shop and the plant can easily deplete that of nutrients so adding more into the mix later on will be needed. You can use w/e works and is available as long as it is well fortified. N-P-K Mg-S-Ca are the main and secondary macros. then the micros are all the rest. Most formulas have the micros in one product and split the rest up between other bottles. The other things I'd suggest is get some sort of light meter in their and see where your standing in terms of PPFD and DLI. I'm not a huge fan of the lights your using but if they working and its all you go keep using them till they die. When your ready for an upgrade there are newer technologies on the market for better spectrum and uniformity as well as efficiency. Keep air flow up and track temps and RH if you can. The photoperiod will not flower till the light schedule is switch to something like 12/12. Its all about the uninterrupted darkness that triggers flowering. And it will stretch and need a good feed when this all happens. I would recommended looking into LST or it will out grow the tent real fast. even some HST could not hurt. like topping or supercroping. As other said some microbs for soil health is good but it should have some preloaded in it. BTi is great for control gnats or even Nematodes. Good Luck!

How can I improve my grow. Knowledge. Experience. Failure. There are 9 cardinal rules of growth, 5 process below, 4 process above. Think of each one as part of a manufacturing process, if one runs at 60% efficiency, everything runs at 60%, no matter how much light you give it. We don't grow nothing we provide optimal environmental conditions for said growth to occur. Cannabis is a game of inches, anyone can grow dispensary grade mass produced tasteless coughy weed. Your plants look amazing for first grow, just keep doing what your doing, try a little extra next grow and so on, keep pushing to learn more. For every question you have answered it opens up another 5, endless learning.

Hello! Your plants look great! You have 4000Watts of LED power in there? Wow. Are you regularly taking PPFD and DLI measurements to adjust position and power of those lights?

Looking good. I Don't quite get tho why you grew an Auto together with a Photo but whatever 😄 Get some mycos (benefical rootfungus) or some Extra Nutes for next time or the Bloom of the Photos. (That Auto is about to be ready for Harvest, adding something now would give no benefit.) Or just keep doing what you doing rn....just dont forget to switch the lighting after you Harvest that Auto to 12/12.