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You're doing a great job. Just make sure to stay on top of the basics!

Tha'ts a tough question to answer. It really depends on if you needed to, do you have the ability to cool the tent from an outside air source? If you don't, then it might be tough to add additional lighting.

When they get bigger, some thinning will surely help you keep the humidity under control!

Lookin good!

Removing every single fan leaf is surely too far, as Hempleton already stated. High yield techniques: dialed in environment with co2 enrichment. perpetual thinning, training and pruning Relative humidity 55% in flowering proper nutrition and understanding of nutrient profiles pH substrate...

Then you're good to go :)

Depends on concentration and duration :)

Blue Lab makes a few soil pH meters. So does Hanna. They are around $80-200 on amazon. Read reviews and decide ;)

Day 58 of Flower. Sour Diesel :)

Low pH and you will uptake micronutrients like Boron, Manganese, and Zinc much more. This will cause toxicity issues. If it's too high, you risk potential phosphorus and micronutrient deficiencies. The pH of your substrate will change over the plant's growth cycle. A 5.8 to 6.2 swing in...

The pH up and down you use is not a buffer. It's a simple up or down correction. The buffers are coming from the nutrients you use (thus the decrease from 7.1 to 6.5 and holding).

Dr. Who is correct...keep that P on the lower side, especially during the plant's transition into flowering. High P will cause the plant to stretch. If you'd like, you can increase the P week 3 of flower. High P is surely not necessary for a huge healthy plant. We recommend around 80-90PPM of P...

A buffer attempts to "lock" the pH at a desired level. The stronger the buffer, the longer the pH will hold.

Ha they sure have a lot of people fooled :) I didnt realize you had seedlings. If you have soil and coco mixed....give pH'd water and microbes only. Let the plant figure out what life's all about before hitting her with any nutrients (especially when you have soil).

A lot of those bottles are extracts and bacteria/fungi. The real nutrition is coming from the A and B. What EC do you get after you mix only A and B?

As you know, nutrient burn and deficiency are on opposite ends of the spectrum. What EC are you feeding? If you are going on the "light" side chances are you are under feeding. You are using a lot of expensive "additives". The A and B products are supplying 90% of the plant's food. We need to...

Excellent advice :)

If increasing your watering frequency is causing the issue, then of course lets do it less :) Bleach in low doeses does a good job of controlling the issue. There are other options as well but bleach is effective and inexpensive. Some guys run a drop or two per 5 gallons every feeding. We...

For a system like yours, in flower, we recommend an EC of around 1.4 (PPM 700 on a .50 conversion).

You did it! Live and learn! She will be ready for that 600 soon :)