Hey, they're all a work in progress. It appears healthy and well, pretty color and nice, fat leaves. My indoor plants are clones from some of my outdoors, or else I'd be using bag seeds, being my first indoor/hydro.
I'm running bubblers in 5 gal buckets, my net pots are 5", and may be a little big but I don't think by a whole lot. My northen light's stem is already about half inch thick. Her monster mother outdoors has a trunk on her big as my fist.
Yeah, it does sound like your water is causing your ph fluactions, and can definitely cause nute lockout if it's too far out of whack. And the plants don't like it too much when it fluctuates a lot, even if it's not enough to creat lockout. Our tap water here has a buffer in it that keeps the ph pretty close to 7. I don't know what it is they use, but it works pretty well. Within an hour, my ph would "rebound" from 5.8 back to 7+-. I had read about this, and figured out right away that I would have to use different water, so I went with distilled. It adjusts easily (ph) and the ppm's are only 2-3, which just makes it easier to figure up the ppm's of my solution. Your ppm's will actually be your reading minus your water's ppm's. Say your ppm reading is 200 ppm and your distilled water has 3 ppm, your solution's actual strength is 197. I tested different types of water- my tap water was around 165 ppm's, and Ozarka was around 45ppm, which is okay, you just have to deduct that from your readings each time.
I know little to nothing about a central resevoir, but can see where it would be simpler to work with. I have a couple different varieties at different stages, and each needs a little bit different nute schedule. I don't think I can accomplish what I'm after with a central res, so haven't put any thought into it.
Do you have the "grower's bible"? It's titled "Marijuana Horticulture the Indoor/Outdoor Medical Growers Bible" by Jorge Cervantes. It is the definitive grower's handbook and it's AWESOME. It covers pretty much everything you want to know, with some 500+ color pgs and 1100+ color pics. I got a lightly used copy off ebay for around $20, best investment I've made, yet. It pretty much makes all my other books obsolete.
Got to run, but I'll check back in a bit with a little more info that I've learned along the way. We'll stumble thru and figure it out!
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