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This comes from a belief that co2 receptors developed in c3 plants during a period (mesozoic) when co2 levels were much higher than they are now and o2 levels were much lower. You might be referring to photorespiration which is a process close to what you describe which assists plants to...

That is exactly right. Secondly start your seedlings in smaller containers. Trying to propagate any seedlings in pots that are too big will cause them to sit in moisture for too long as the roots are unable to use up the moisture in a pot that size in any reasonable amount of time. Soggy roots...

Just looks like shock to me. Give it a few more days, thats always the general rule.

If you live in a high botrytis area and you have access to serenade then it is best used about 2-4 weeks into flowering. Although, it is a naturally occurring bacteria and will eat itself to death on the botrytis leaving no visible residues. However it works best as a prevention rather than a...

As a general rule, if the strength of the salt content in your grow media (which we will call the E.C) exceeds that of the salt content in your plants roots and stem, then moisture will be leeched out of the plant rather than in. This happens irregardless of whether or not you have the pH...

Firstly you want to find some proper seedling mix. Seedlingss do not need any nutrient or any other crap in the mix to kick them off. Secondly, choose a grow container that matches the size of your plants, in other words do not use a rather large pot to grow seedlings in. A 1 inch pot would be...

It looks to me like it has been sitting for too long in over moist soil leaving the plant with little air to breath in via its roots during the respiration cycle plants go through when lights are out. With no o2 being able to be uptaken by roots, the carbohydrates break down into alcohol...

Its best to use hydrogen peroxide every 4-5 days anyways irregardless of whether you have root rot or not. Prevention is by far the better option rather than having to deal with pythium. Take Moon Ravers advice and freeze up a stack of bottles. Drop them one at a time in the nutes during...

What is the feeding regime times you are using in terms of the pump running.

What is the E.C and when was the last time you changed the res.

Can you tell us about your setup, saves people having to guess. Lighting, air intake, air extraction, pH, E.C, temps, soil type etc

Tell us a bit more about your setup. Temps, lighting, air, E.C, pH etc.

Was it doing this during veg?

What strain is that, red stems are quite normal depending on the strain. But if it is not one of those strains....then going by the deep color in the fan leaves they may have a little too much nutrients for their liking. A light feed of 20/20/20 for small plants, in potting mix, can last them...

Technically speaking you pretty much have everthing set correctly. Couple of more questions for you: - How are the roots looking? - What color are they, - Are they bushy or stringy, - Are there brown streaks through the roots or are they all fluffy white, - Can you get a picture of the...

How does your root system look?

There is an assumption that plants do not need much nitrogen after switching to flowering. In actual fact in the first 3 weeks after switching, some plants can consume almost all the nitrogen they have in stores. In particular plants that put on growth spurts that can result in them almost...

When you transplant, some plants in particular young plants will go into shock. The best method of transplanting is to soak the rootball first with fresh water before transplanting then after potting, water the new pot thoroughly thus giving even moisture throughout the pot and flushing away...

What is the pH of your nutrient? What is the temperature of the nutrient? Room temperature? Airflow? Humidity? Light cycle? Nutrient airation? Also when it comes to hydro type grows you do need to be giving your plants some nutrient albeit very light amounts, are you able to measure the...

Kinda looks like its been sprayed with weed killer.