Awesome start!
Your doing very very well I would say considering you built this ship yourself!
You have alot to be proud of. I'm glad I found the thread and will be of any assistance I can.
They really look like they are thickening up well.. I help in question form...
1.)Do you use any Cal/mag supplement?> this can be an issue with RO water, I'm not familiar with the nutes you are using, they may cover that for you in there.
2.)Ever thought of perhaps using any Applied Biology>? such as subculture M and B? the M makes my roots fishbone which makes me real happy! ( I say this b/c u already have the water chiller) this product I would not recommend without a chiller)...
3.)What kind of pruning do you have in mind for these girls Single Cola or bushy?
4.) A air stone in your res may help up o2 levels by bringing in outside air to a pretty tightly closed system.
Your killin it! My highest respects.. hope these questions help...
Aeropro-
Hey man, checkin in, looks really great, I'd say they could handle more like 800ppm at this point, so long as you keep you ph in check. mmmmmm 66, they fucking love all that O2 at the root level!
What I was talking about is a product from GH call Subculture-M and Subculture-B. They work really well, specifically with hydro applications with a chiller... because the powder itself is a live culture of several dozen species of living organisims, that promote positive uptake, protect roots from disease, and generate healthy root situations. These basically allow your plants to uptake more, and become more resistant to disease....
As far as what you would see from the Subculture-m in real time,, as in the aqueous roots in the picture you took,, rather then being straight like spaghetti, would instead start to develop in a fishbone type manner. More surface area,, more roots,, more uptake. ie: by fishbone I mean that they would shoot off branches and look like a fish's ribs.
If your rots get too long for the tubes,
just lift them up and push them back into the tube.
It is best if you do not allow the roots to grow into the rez.
.