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roots tend to grow more during the dark cycle

Coffee ground are high in nitrogen, but its budding so you dont need it. its a phosphorus deficiency, and your plants are budding. its looking fine, just give it a bit more phosphorus. Your plants are going to naturally lose leaves as it flowers too, so dont get to scared when some fall off

The leafs look a bit curled, what is your pH at? PS: To get rid of the lines on your camera, you have to change the White Balance, not sure which one, i think fluorescent worked for me.

Flush and give them just water for the next few weeks. You have to flush 2 weeks before your done anyways

Def not nitrogen deficiency, you would see even yellowing if you did. I doubt its potassium because plants dont need much potassium until they start to flower. To me it looks like a few things, mainly pH imbalance and lack of circulation. What is your pH at and what is your circulation like? temps?

your "claw" is caused by a pH imbalance, and theres lots of posts on this

I flush my plants when 75% of the pistils turn red, and harvest when all the pistils are red

5000K bulbs are not very good because it gives out a lot of spectrums your plants dont use. 5000k is right around the green spectrum, and your plants dont even see green light, it may as well be dark to them. Go closer to 6500k for veg and 2700k is good for flower

look for pollen sacks. I doubt it would be a hermie at that stage in flowering, you will see pollen sacks way before any of the hairs turn red

What do you mean revegging bud? anything with resin (or as you say, frost) will make hash

not a bad rough outline. Twisted growth is usually pH though, and you can get spots from potassium too. Dieing lower leaves are natural, and doesnt necessarily mean a deficiency

i bought a cheap pH tester and it gave me different readings when i held the pen in different spots. spend at least 100 on a good pH tester, a very worth while investment. pH is key to so many problems

Looks good to me, the first 2 weeks you wont see much new growth, but it will keep speeding up to week 5-6 which are your biggest growth weeks (on an 8 week flowering plant)

Neem oil is a natural oil and thats what i use for mights and it works great! Because most mites/bugs breathe through their skin, the oil will cover them not allowing them to breath and is much better for your plants then chemical sprays. Another way to get rid of mites is lady bugs. Some...

They wont be nitrogen deficient in flowering. The leaves also go yellow if you have a phosphorus deficiency, but thats when more then half of your leaves go yellow. You will always have yellow leaves, most of your leaves will fall off by the time your done flowering and thats totally normal, the...

ya it looks like the roots are drowning or the water res temp is too high. Your res temp should always be below 74ºF or else you will get bacteria in your water. Looks like you need waaay more light too, that will speed up growth and help with everything

You should upgrade your human timer for an electric one haha

pH levels change quite a bit, theres not much you can do, you should be checking twice a day anyways. Pretty much the only con with hydro

Your plants wont need any nutrients until they are at least a foot tall, so dont give them any nutes. it does sound like heat stress though, what is your ventilation like?

Flush with just water, at least as much water as the volume of the pot, THEN flush with a new nutrient mix And you dont have any deficiencies, looks like you got bugs, check under the leaves for black dots and white eggs