Day 61 -- Switch to "Late Bloom" Nutrients
Reservoir refresh
Today was the weekly Saturday reservoir flush, rinse, and fill.
I switched to a "Late Bloom" low nitrogen, high phosphate ratio of 0 Grow, 2.5 Micro, 5 Bloom. pH 6.1 and 530 PPM (no pH adjustment to my 28 PPM water).
A moment's inattention and bad things happen...
When I measured the pH and PPM of the second 2.5 gallon batch, it was way off, so I poured it down the drain and did it again. On the next batch I got the same values as the first batch. I'm methodical to a fault, but this is the second time I have caught myself goofing up a simple mixing and measuring process. Ya gotta pay attention!
Another pH crash
The pH this morning was 5.0 after having stayed between 6.5 and 5.8 all week. I don't understand why these pH crashes keep happening. (They do seem to happen at the end of the week.) PPMs were 440 last night, and they have been that low on a number of nights before. So is it an imbalance? That seems unlikely given that I top off the nutes daily or even twice daily with fresh stock. I wish I understood this better. The only real change has been that the reservoir water was up to 83 degrees after some warm weather.
40% humidity for the bloom cycle
I have read enough horror stories about bud rot and mildew that I want to make sure the humidity is low as the buds get denser. I also have two small fans for good air circulation and my grow area is not all sealed off like some tents seem to be.
3" long bud (fingers in background for scale) is the biggest of them all. It is getting denser as more calyxes fill in.
) for closer and steadier shots or to use a different, better magnifier.
As I write this, it occurs to me that I have been measuring the volume in the reservoir with a dipstick (a ruler). As the volume of the root mass has increased, the amount of fluid for X millimeters of depth has been getting lower and lower. That is, effectively, as the volume of roots has grown, the volume of fluid has decreased! That was dumb. I'm hoping that significantly more volume will mean significantly better pH stability.
How exciting!!!! you are almost there! Do you see any amber ones yet?
I do think that the dipstick method could cause you some issues, I will post a pic of what I did on mine to make sure I can see what level the water is at, maybe this will be much better for you, hope it helps.
Thanks! There are some amber ones, but I think those are mostly from the lights being too hot and my banging into them? Most are still virginal white.
A sight glass! Just like on a steam locomotive's boiler! Cool.
Definitely a lot less fussing than sticking a millimeter ruler into the tank twice a day and then trying to read it with a flashlight. 
She lied to you.....lol
A sight glass! Just like on a steam locomotive's boiler! Cool.
