What up guys. I read this post this morning. I am looking for an answer to a question I have.
As for your yellowing spots, I experienced something similar to this when I was wind burning my plants, this was the first sign. I was trying to keep the top of my canopy cool, but needed to have my a/c blowing right on them to compensate for the heat coming from my hps. I raised the light a tad, and installed an oscillating fan. I thought for a while that my mix was too hot, then I thought it was ph, none of that was off, still changed it anyway and found no help.
Also, If you guys want to avoid the clogging your misters - remove them. Provided your pump will still get water to all the holes once some of the pressure is taken off, the holes in your pvc pipe will provide all the water your plants can absorb. Your roots are long enough to reach the outsides of the netted pots and bottom of your trays so you dont need the mist to moisten things anymore. I have been growing with an areoponics 24 site for a while now, I like it a lot. One of the first modifications i made to it was to eliminating the chance of clogged misters to ensure all my plants were getting water.
Also because of the type of system you are using your plants will have plenty of oxygen in the air without turning your pumps off. I run my pump 24/7 as well... This makes sure that your plants are absorbing all the nutes they want when they want. I would recommend, if you dont already have one, get an air pump from the pet store. You can get one for 15 or 20 bucks this will ensure that your water always stays oxygenated.
Things look great, you seem like the type that pays close attention, you will make a good indoor grower, keep it up...
