First time coco grow

I have not yet calibrated my PH meters, BUT I had a 4.00 and a 6.86 buffer powder to test, and the result showed that my solution meter is about -0.25 of the correct value, so that is what I do when I use the meter About a week ago the both seeds have germinated and came up from the coco. Everything seems to go smooth, and I have started giving my plants nutrients

End of week 2. Plants seems healthy and are growing fast. Everything seems smooth and I am planning to top them soon, and then start LST training afterwards

Today I decided to top the biggest plant, and wait with the other one Day 18: New pics added with better light. I think they look good and healthy. The light used to take the pics made the leaves look a little more light-green than they are Day 20: I have adjusted my nutrients a bit. I am holding a little more back after a comment from @Grower202085 making me nervous about the EC levels. My tap waters EC is 0.4+ and after some research I should avoid using water over 0.3 EC. As I don't have a good filter to clean my water, I down adjusted my nutrients a bit, to get a more acceptable EC level. I guess I have to invest in some filters..... I have also read up about watering. I thought growing in coco was more like growing in soil. As I understand, I need to water my plants at least once a day. I was watering every 4~ days, but that is going to change from now, and I properly also need to invest in a automatically watering system, but that have to wait

Day 22: Yesterday I topped the little one too. The little one is almost a week behind, and it might have been too early... I kinda regret it now as I have been thinking the last coupe of days that the plants seems too grow more slowly than they started. Now I also see some light-green stripes in the middle of my biggest leaves. I think something is going wrong here, any ideas? Day 24: I have read up about on all of yours answers, and thank you so much for your comments! I think there is a magnesium deficiency and have adjusted my nutrients once again, adding more CalMag and Rhizotonic. I've found out that leaving my nute mix for an hour or so my EC levels fall, thats why I still have an acceptable EC level at the end. I did also adjust the PH level to 6.0~. I gave it to my plants last night and measured the run-off about 12 hours later. The EC level was about 1.0 so the plants seems to have gotten some nutes. The PH level is another story. The measured PH level of the run-off water and it showed: 7.0~. Is that normal? Day 26: I now think I know what's the problem. I defiantly have a Magnesium deficiency, and I think it is caused by interveinal chlorosis, caused by too high pH level in run-off water (big thank you to @Creepy_Steve). I am now lowering the pH to 5.5~ in my soloution mix, and test run-off, as recommended by @Creepy_Steve. Atm I am getting 6.5~ ph reading of run-off so I'm continuing with ph 5.5 until I read 6.0~ in run-off water. On another note, I have started LST training. I of course snapped off one stilk, and I am so mad about it. I think it was a little late with the big one, and the stem was a little too strong, thats why I unfortunately snapped off one stilk

Day 29: I adjusted the PH of the water to 5.5 and gave it about 30% run off. The run off showed PH of 6.5 and everything seems to go smoothly. Next time ill give them 5.8 and hopefully I will get 6.0~ in run off water Day 33: I am still getting bad ph readings from my run-off water. I can't believe it.... I gave them a mixtures with a ph level of 5.8~ and measured the run-off (48 hours later) at 7.3 ph. Very strange that the ph level of run-off water as increased and I have no good answer. I re-tested my ph pen by making a new mixture that shows 5.8, and immediately tested the run-off water again, getting the same result = 7.3..... The plants seems to grow fine, and looks healthy so that's a good thing. I just want to give them the best environment as I possible can, but seems impossible to correct the ph level of run-off. Any one have any idea on what is going wrong? Or what I can do?

Day 37: The plants are growing strong 💪 BUT I see some problems, not too much. I still see the magnesium deficiency as I have a very hard time to correct my PH level. I have watered many times with PH 5.5 - 5.8, but the run-off water always show around 7.0~ PH. I am doing some tests atm to try finding the cause. Atm I have 7 cups to test my nutrients/water. I started with 5 cups, measured 1200ml water to PH 5.54, and filled each cup with 200ml of the 5.54 PH water. The first cup I did nothing, 2. has 1ml of Canna coco a and b added, 3. cup 1ml of Rhizotonic added, 4. cup 1ml of Cannazym, and last 1ml of BioBizz CalMag. I then tested each cup PH, re-tested 10min, 30min, 2hours, 15 hours, and 24 hours later (So far) and all cups have increased PH level. The CalMag cup was the worse with an increase of 1.7 PH (went from 6.16 to 7.87). Even the first cup, only containing tap water (PH'ed with acetic acid) has increaed PH of 1.05 (went from 5.54 - 6.60). This seems very odd. Is there a problem with the tap-water? I decided to test my water against some store bought. I have only just started the test and I don't have the results yet. We must see tomorrow Day 38: Nothing makes sense to me anymore regarding my PH tests.... Every time I test a cup, no matter with nutes or not, with tap-water or store-bought, the PH increases on every test, even if I test them after seconds. I was expecting small +/- in my readings, as when I have tested 1 cup I test the next, and some small drops might land in the other cup, although I try my best to clean the meter between every test. I am clueless here.... Plain tap-water has increased ph from 7.85 to 9.10 in 44 hours. Store-bought water has increased PH from 7.84 to 8.70 in 20 hours. Can anyone explain me what is going on? Any idea what I could do? I did test my meter by making a new mix of water and acetic acid and got PH 5.5~ and than tested the old tap-water cup to the same as on my schema, and than the new mix again which showed about the same 5.5~. The meter might not be as accurate as the manual tells, I would say its maybe 0.2 +/- but defiantly NOT +/- 1.0+ Day 41: Plant have entered flowering state and I still have problems with the PH and now also EC. My tap water is showing 1.0 EC now. I have ordered a couple of things to make sure my PH and TDS meter is working properly and have to wait for it to arrive. Until then, I won't do anything, unless I have to. Hopefully the stuff will arrive before they need water. The plants are still growing fine, but I see some problems. I still have small signs of magnesium deficiency. I also see a little nute burn, properly caused by my suddenly high EC in tap-water (but not sure yet). I am not sure if there is other problems too, there might be, and I think it will be more easy to diagnose when I know the correct PH

Day 49: Plants are growing strong again. I see almost no signs of trouble, other than a little magnesium deficiency as I still have trouble with correcting the PH. I am currently using 50/50 tap-water/store-bought so my EC is around 0.6 before I add my nutrients. The PH level is around 8.5, and I lower it to 5.5-6.0 with a more reliable PH measuring method, but far less accurate. I have ordered a reverse osmosis system, and will check if I can get a stable PH level using that. If not, I am buying some PH-down with phosphoric acid that should keep the PH level down for a longer period of time. For now everything seems to go smooth so I'm not panic :)

Day 55: I have finally moved the girls inside the tent :) On 1 of the 2 girls I see some brown spots, and some yellowing and are thinking something is wrong here? I think it might be a Mag + Calcium Deficiency and I think I should up the PH a bit, but what du you guys think? The other girl looks healthy and fine, although I see some light-green color, but not too much. It might be a beginning of what the other girl is suffering from. I have not measured my run-off water for some time, as I am having trouble with my meter, and are falling back to the color-tester (drops) which are far from accurate. I also got my reverse osmosis system, and I now get 0.08 EC water. My water was 0.9 EC before so I'm happy with that. Also the PH has dropped from 8.5+ to around 7.0-7.5 so I think I am able to make a more stable PH change with acetic acid Thank you for all the answers!. I am now going for ph 6-6.5, and I have also increased the nutrients I use, as I am now using RO water. I am also setting up my lamp from Mars Hydro today, pictures follows tomorrow

Day 58: Everything seems to go smooth. I got my new lamp up, and are experimenting with dimmer, hang height, and space between the bars. This is new for me, my old lamps is garbage compared to this! But as I have 2 pre-/flowering girls, and 4 babies I decided to go with little space between the first 4 bars (for the adults) and the last 2 have some more space between (for the babies), and are not going all the way to the edge. The adults is higher, than comes the teens, and finally the babies so they don't get the same light intensity. I am currently running it pretty low, about 35% and will see the next couple of days how the girls will react Day 61: The girls are starting to hang a bit. I do not know what is causing it, or is it just normal? I took the pictures and video about 3 hours after the light turns off, so it might just be that they are sleeping? Other causes could be too little light, as I just switched to my new light, and are running it for the first time. Maybe I do not water them enough? The humidity has also increased, and is around 50-65%, maybe that is the reason? I also started using RO water, so could be something with the nutrients? Do any of you fellow growers have any idea? UPDATE: Big thank you to @Maltaherbman for your answer. I have raised the lamp a bit. I read 900+ ppdf on my phone before, and now I am getting maximum 800. This is properly not a correct reading, but at least I have it to compare with. I waited to see what happened after the light turned on. Ill took 2 new pictures, and the left lady is all ready recovered, the right one almost, so they might just have been sleeping, but ill keep the light as it is for now. Also a big thank you to you @GrowingGrannie - I keep the coco wet at all time. I have been flushing them a couple of times before, so maybe the watering volume this week is a little lower than usual. Also the watering volume is kind of an estimate, but I will take your advise and keep better track of how much I am watering, but I think its about 2-3L every 2-4 days

Day 64: It seems to go well. I am still keeping an eye on the "hanging" leaves. I think they tend to hang a little more when light on, and less with light off but its hard to say if it is normal. It might be as @GrowingGrannie mentioned, they might be under watered, as there is not much run-off at the last couple of watering's, maybe 1l each time and I will give them a 30% run-off next time to be sure UPDATE: I have noticed some more brown spots on the right plant caused by Calcium Deficiency. I think I should up the PH a bit more, going for 6.5 this time. I will also increase my CalMag supplement by 50%, and do 30% run-off today Day 66: Thank you all for the kind answers 🙏 You all have different opinions, and it is hard to pinpoint the exact problem. I am almost certain that I got some heat/light stress as mentioned by @GrowingGrannie and @Chow_13. I have therefore raised the lamp and are keeping the dimmer very low, using about 140W in total. I am still investigating if there might be other problems to it. @m0use, thank you for your answer. I do not think they are thirsty, at least not any more, as I am already on the subject for the last couple of days. About PH, It was difficult to get a good picture of the PH solution, but it was light-green to green (6.5-7.0) on the picture (And that was run-off PH) and what I put in was adjusted slowly from yellow to light-green aka 6.0-6.5 (I wrote 6.25 but it was auto adjusted) @gottagrowsometime, thank you for the answer. I do not think it is a nitrogen toxicity. My leaves aren't that dark green, although they are a bit to the dark side but not like what I see on other pictures with that problem. I also think the curling is caused by light/heat stress as I just got a new lamp and are experimenting with it. But I will keep your suggestion in the back of my head! @Chow_13, thank you very much for your answer. I think you are spot on, however I am not sure it is the only problem... It might be as you say, nutrients are not absorbed correctly due to the light-stress, but I will not put all my money on that @Nugsery and @GrowingGrannie, a big thank you for your answers. The deficiencies might not be the same, but the cure is very similar. I cannot make up who is right, but I do have a plan. I will follow your recommendation @GrowingGrannie and @Nugsery, and do a flush, but with a ph 5.8 as both nutrients should be able to be absorbed in that level. I will then give her a light nutrient mix and adding PK, also 5.8 ph. This is almost the same solution for both deficiencies. I will then slowly get the ph back to 6.2 @ernesttwwg, thank you for your answer. I have known for some time I have some Interveinal chlorosis, but I do not know what is causing it. There is multiple deficiencies giving those symptoms. The tacoing of leaves, and leaf tips curling down I think is caused by the light, and I have therefor raised the light. I will keep investigating the symptoms you mention OBS: I will not edit my nutrient schema as this is only temporarily, next watering will be as described UPDATE: After flushing with 15L~ ph 5.8~ and a small feed with 5.8~ ph I still get about 6.5~ ph in my run-off water. I am going to do another flush tomorrow to see I can bring it down to around 6.0~ ph Day 67: I think I see small improvements on the leaves. The new heat/light level seem to have done something. I did that second flush and are still getting about 6.5 ph in run-off.... I think I will let her dry for now, monitoring what happens, and do another flush in a couple of days

Day 71: The left plant is starting to show some of the same problems I see on the right plant so I am going to flush her too tomorrow. I think that it is mostly due to the light stress from before, it is just showing now, but to be safe she gets a flush too @5.8 ph Day 73: Hmmmm... It is difficult to see if the problem persists, or its just the affected leaves that will not recover. Should I remove these "sick" leaves? - They seem to be happy abut the new light intensity as some of the problems is defiantly improving like the leaves are praying, and the sides of the leaves does not seem to bend as much. I have been very gentle with the feeding, after having done 3 flushes (15L at 5.8 ph) and have updated my feed schema above Day 75: I am sure that I had some light-stress, and it is over now, but I don't think I see a full recovery.... I think I see the leaves to get more yellow but it might just be as mentioned before, that the sick leaves won't recover but I do not know what to do from here. Should I just leave them, or do you growmies have any suggestions? The grow has, and is, very slow in my opinion but I still see progress UPDATE: I decided to doe some heavily defoliation. It might have been too much for the left one. I haven't done much defoliation, but they where so bushy, that I thought it was necessary to get light on all my buds. Also I wanted to get rid of those "sick" leaves. I think I am on the right track, and the symptoms I see are old problems now

Day 78: These girls start looking awesome! It has been a slow, and educational journey so far and we are nearing us the end. The defoliation from last week seem to be perfectly done. I was afraid I was overdoing it, but it looks like she is getting more bushy all the right places

Day 85: The left plant is developing much slower, and I think it is caused by light stress. The right plant needs more light than the left one, so I have lowered the left plant. I don't understand why this grow as been so slow. They had problems through out there grow, but they are growing fine in size, and the left plant has much less noticeable problems. It might have something to do with the big pot size maybe?

Day 92: I think I got the hang of it now. Everything seems to go smooth from now on. It is by far the slowest autoflowers I have ever grown, but I had a lot to learn, and was expecting lower yields but a faster grow. Now I think its gonna be an awesome harvest, but it has been slow

Day 101: I have re-arranged my girls in the tent once again. This light is so intensive that I have placed it has high as possible and only running on 25%~. These girls are still very slow growing, but hopefully they will soon see the end