Two important questions, 21 days flowering

Im on my 21st day flowering, three females left, one small 12 inch plant and two 3-foot size plants. My first question is about picture #1, towards the very top of my plant the leafs are curling around the edges, but no where else on the plant and the other plants aren't doing it. Is this just part of the flowering process? Maybe lack of light to that part of the plant cause that one out grew my lights?? The second question is how long can this aeroponics system go without water?? The reason I ask is because I'm leaving tomorrow for vacation and I'm going to be away for three days. I've been paying attention to it alot recently and the resevoir goes empty at about 2 and 1/2 days. So I'm thinking there is going to be maybe a full 24 hrs that the resevoir will be empty. Will this kill my plants? Harm them? or will they survive it? Sour diesel strain, 10,000 CFL lumens, flora grow and bloom is the nutrients i'm using, resevoir is at 800 PPM and a PH of 5.8-6.2. Any input is highly appreciated because i'm leaving in 24 hours, thanks in advance!

The shortage of water should be absolutely no problem for the plants as many cannabis plants in flowering can go up to 3 or 4 days without water. As for the curling of the leaves, that might be explained by the plants receiving too much water. However, it really doesn't look like much of a problem anyways and your plants are looking very healthy. This 24 hours without water may actually turn out beneficial for the ladies. Good luck, have a good vaca! :jointsmile: .StAYhIGh.

oops my fault! Disregard what I said about 3 or 4 days without water, I was thinking soil for some reason. Hmmm for that thing you're right, 24 hours without might really be a problem. The only thing I can think of is to either make some sort of contraption that will refill the water or get someone you really really trust to do it for you. I definitely would not let those roots go dry for 24 hours though.

Your first comment made me feel so much better, then when I read your second one, it crushed me!! I've been trying to think of something to refill it for weeks now, I can't seem to think "outside the box" on this one. Maybe a water pump from one resevoir to the root resevoir on a timer for like a few minutes??? Any ideas?

You should try and maintain a relative constant water level, because as the level drops the PPMs and salt concentration rise. not good. Ph will also change

I know a lot of plants can go a while without water, but its a stressor, sometimes a good thing but usually NOT

put them on Ph corrected water for a few days, then go back to nuits. see if those top leaves straighten out , if not no worry.

Daddy