Subsribed! What a grow. I thought I put a lot of work into my room. But there is still a lot of work to do when some money comes in. Took me 2 days to get through this whole journal. What a good job(minus the Feed, feef, feed prob). As far as your little O2 mix up, a tank really isnt suited for your room. You should really take a chance to look at some CO2 generators. They can do wonders. And for what you've spent already, fairly cheap. Also saves you the work of refilling all the time. They can also kick out a fairly lage supply of co2, even enough to make a difference with your exhaust running(not recommended though). Keep up the amazing work. I cant wait to see these girls finish. If you get bored, check out how my white widow is doing. Link in my sig. Also on a side not of your lights not being able to cover all of your girls completely, you may want to look into lst with ties or a Scrog like mine. With those lights and an even canopy, you can get an insane grow that would probly fill out every square inch of your room. Just a though that could potentially double your out put(those lower brances aren't getting the love a trained plant would get) Even without that, I'm sure your outcome will be legendary.
Hello!
you could have 2 plants under one HPS light
other way nice setup & bush
....Thanks Dude !!! ROCK ON !!!!! 
wowzers!
