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Yes, you need the circulation fan, in addition to the exhaust. I'm not sure what you are missing (since you are bumping)? It's only you who can judge how dry your bud is when drying. It depends on temps, humidity, fans, etc. Be sure to monitor them daily, so you know when it's time to jar - or...

It will work fine. However, they will stretch more than if you used MH (or more blue light).

Are the leaves OK at the beginning of the day (when the light turns on), and going droopy after some time (like say 8 hours of light)?

Search for curing and read about it. I used to dry my harvest slowly, but no curing. But after I tried curing last harvest, I will always do it from now on. It really is worth the time! Curing will, among other things, break down chlorophyll - resulting in better tasting and smooth-burning buds.

Yes, using BioBizz Grow and Bloom, which are designed to go together. I have two grows behind me with those nutrients. I can't even imagine all the work watering plants when you have to prepare several bottles just for one single plant. If I were you I would call/mail the company behind your...

The HPS-light could be fooling you. Cut off a sample, then check the thrics with your scope on a white piece of paper. You'll then easily see what stage your thrics are at. Maybe more are milky than you think. Then smoke the sample. Then decide.

Sorry for my english, and in addtion I'm stoned. Those leaves you are talking about are "sinks", they are collecting nutrients and does not easily eat themselves (different from fan-leaves). I guess you gave too much N going into flower, and those "sink-leaves" are holding it - giving the...

@thomas: You cannot mix nutrients together? Water with each nutrient separatly? Why? Never heard that one before (but I'm not familar with those nutrients).

"break from them ... good riddins" Hehe... I know what you mean :-) I think I need a couple of months free from growing after I harvest this time.,, Anyway, they look nice to me, especially the first picture. What strain is that? BTW: do you let the medium get very dry before you switch to 74...

I agree, I never had any problems with low humidy. One grow had about 20% from seed to harvest, and no problems. Of course, not ideal levels. But to me, it seems humidity is not that important, maybe keeping it constant is what really counts (the plants adapt).

When I think about it, the reason I got less yield was probably not related to this issue. To be honest, I'm not sure. I did harvest when it started to progress into the the buds, but it was time anyway (I was lucky, got problem late in the bloom).

When lights go off for the last time, I make sure my medium is not saturated (recently watered). Then I give them 24-36 hours of darkness, and chop them before they ever see any light again. This last bit has some science behind it, but the 24-36 hours darkness might be a myth. I do it anyway :-)

I'm not sure what you are asking (sorry for my english). Last harvest, I had one plant which was very yellow, even the small leaves connected directly to the buds where going yellow and even crispy. But the buds were fine to smoke, I only lost some yield. So I don't think you need to worry...

That looks like moisture stress, your humidity probably was too low with lights on. They curl like that trying to conserve moisture.

Recently fed? It might be a sign of overfeeding. Too near light? But I'm just guessing as you did not give any information at all about your setup etc.

Yes, 5000 Kelvin sounds great (typical blue CFL is 6500 Kelvin). Regarding yield, I don't believe a couple CFL's, added in late flowering, will do much for you. But I'm just guessing. Personally, I would have used 250 Watt MH in addition to your 400 watt HPS. You're already talking about 200...

If you have not bought them yet, go for blue CFL's (veg). MJ loves both spectrums during flowering. However, CLF's don't "reach" far and have very poor penetration, so covering all 4 plants might be tricky. So you might not gain much, but if money is no issue...

Never grown autos, have no idea about your yields. White tips could mean slight over-feeding (burn). You said you only feed BioBloom? You need BioGrow too (yes, during flowering).

Search for "citric acid" for PH down during flowering. It has other benefits than simply being a PH-down, like making P more easily available. Edit: I'm a compost grower, it might not apply to other methods.

Can't believe nobody answered. Grow a sativa until it is ripe. Grow an indica until ripe. It's not about harvest time, but genetics. I know harvesting at different times gives different effects, but you will not get a true sativa high no matter when you harvest your indica. In other words...