I see you've had some problems with fungus gnats... what you want to do is get yourself some Mosquito Bits and follow their directions (you have to soak the granules and then use the water they've soaked in to water your plants)... fungus gnats live IN the soil and that's where Mosquito Bits kill them. Unless it's a really bad infestation, one dose will usually take care of the issue but the directions say to use it once a week for 3 weeks and this is what I'd recommend. For me, one dose took care of the problem ...
When growing autoflowers, resist the urge to give them any nutes for at least 2 to 3 weeks - they don't need anything and actually react badly to them. When you DO start the nutes, give them only about 1/4-1/2 the dosage recommended ... if they tolerate that, you can increase the doseage. Autos also need to be started in the pot they're going to finish in - they really hate being transplanted and their growth might be stunted to the point where they will not produce for you. When you water, always water so that about 10-20% runs off out of the bottom of the pot - this makes sure the nutrients aren't being accumulated to high levels in the soil which would cause a lockout and even more problems!
You've had a rough go of it for several grows, I think... don't give up... growing weed can be challenging but you learn something with every single try...
Good luck!
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